Abstract: A media enhanced shopping cart system comprises a shopping cart comprising a frame, a basket, a handle, a base tray, a plurality of wheels, a read component for performing a proximity scan of the shopping cart, a locationing component for determining a location of the shopping cart within a store based on the scan, and a display component for displaying at least one advertisement for a product based on the location of the shopping cart within the store, wherein the locationing component is further operable to determine a location of the product within the store relative to the shopping cart based on the scan, and wherein the display component is further operable to display an indication of the location of the advertised product relative to the location of the shopping cart.

Abstract: A wireless communication device includes a Near Field Communication (NFC) interface, a transceiver, and a controller. The NFC interface receives data related to multimedia content from an external NFC tag responsive to establishing an NFC link with the NFC tag. Based on the received data, the controller establishes a communication link with a multimedia server via a wireless communication network, and controls the multimedia server to download information associated with the multimedia content to a user-specified destination device.

Abstract: A method and system for managing a product during assembly or repair of the product includes use of a microserver configured to function as a local computing workstation and collect, store and process data for the product throughout the assembly or repair process. The microserver may be carried by a support structure that supports the product through the assembly or repair process. The product data and other information relevant to the assembly or repair process are stored on the microserver and may be accessed by other computing devices, both local and remote to the product. The information is updated on the microserver as it happens. Thus, users are able to track a status of the product in real-time. The microserver enables two-way communication such that the other computing devices may also send information to the microserver.

Abstract: A movement information determining unit determines a moving direction and a moving speed of a user using position information detected by a position information detecting unit. A moving-speed determining unit determines whether the moving speed exceeds a predetermined threshold speed. An information display unit displays high-speed movement information corresponding to the position information and the moving direction when the moving speed is determined to exceed the threshold speed, and low-speed movement information corresponding to the position information and the moving direction when the moving speed is determined not to exceed the threshold speed.

Abstract: A media enhanced shopping cart system comprises a shopping cart comprising a frame, a basket, a handle, a base tray, a plurality of wheels, a read component for performing a proximity scan of the shopping cart, a locationing component for determining a location of the shopping cart within a store based on the scan, and a display component for displaying at least one advertisement for a product based on the location of the shopping cart within the store, wherein the locationing component is further operable to determine a location of the product within the store relative to the shopping cart based on the scan, and wherein the display component is further operable to display an indication of the location of the advertised product relative to the location of the shopping cart.

Abstract: In one exemplary embodiment in accordance with the invention, an order-picking system includes a picking cart having a radio frequency (RF) antenna arranged above an object-stacking surface of the picking cart. The order-picking system further includes a radio frequency identification (RFID) tag reader coupled to the RF antenna. The RFID tag reader is configured to identify a first RFID tag attached to a first tagged object placed on the picking cart and further configured to eliminate identification of a second RFID tag attached to a second tagged object located outside a perimeter of the object-stacking surface of the picking cart.

Abstract: System and methods for identifying a lost or stolen device. In one aspect, a method includes: receiving a plurality of items on a platform configured to support the items for transportation, one or more of the items being registered in a database; interrogating via an interrogation signal transmitted from a radio frequency identification (RFID) reader to one or more RFID tags attached to one or more of the items while on the platform; and communicating with the database over an Internet to identify an item as being missing and associated with the platform, based on a result of interrorgating.

Abstract: A system provides on-demand operation of a mobile electronic device mounted on a vehicle such as a shopping cart. The system includes a detector for sensing movement of the vehicle and device. Further, the system includes a controller electronically connected to the detector and to the device. With this interconnection, the controller may switch the device between an operating state and a resting state. Specifically, the controller establishes the operating state upon initiation of movement of the device. Also, the system is provided with a timer that is connected to the controller for switching the device to the resting state after expiration of an uninterrupted pre-determined time interval.

Abstract: A contactless data communication system includes a reader-writer device, a contactless identification tag including a plurality of contactless identification tags, and baggage including multiple pieces of baggage. The reader-writer device includes a data reception part, a data transmission part, a control part, an operation part, and a display part. The contactless identification tag includes a data communication part, a data control part, a voltage monitoring part, a detachment detection part, a display processing part, and an electrophoresis display device. The voltage monitoring part and the detachment detection part detect a voltage change caused when the contactless identification tag is detached from the baggage, so as to detect that the contactless identification tag is detached.

Abstract: Disclosed is a principle for alternately activating and deactivating a blocking device by means of a magnetic field. A further developed embodiment of the invention is characterized in that the deactivating magnetic field can be smaller than the activating magnetic field.

Abstract: A method, system and apparatus for facilitating dwell monitoring in a retail store, including detecting and monitoring the number of shoppers in a store through the use of broadcasting devices, such as RFID tags, and associated signal detecting devices, and a processor for processing the information, and storage media for storing the information, as desired (such as, for example, a computer), and an event engine for comparing the information processed with threshold data to generate alerts when a threshold is reached.

Abstract: A vehicle tracking system includes a wheel containing sensor circuitry capable of sensing various types of conditions, such as wheel rotation, wheel vibration caused by skidding, and specific electromagnetic and/or magnetic signals indicative of particular wheel locations. The sensor circuitry is coupled to an RF transceiver, which may but need not be included within the wheel. The wheel may also include a brake mechanism. In one embodiment, the wheels are placed on shopping carts and are used to collect and monitor shopping cart status and location data via a wireless network. The collected data may be used for various purposes, such as locking the wheel of an exiting cart if the customer has not paid, estimating numbers of queued carts, stopping wheel skid events that occur during mechanized cart retrieval, store planning, and providing location-based messaging to customers.

Abstract: A vehicle tracking system includes a wheel containing sensor circuitry capable of sensing various types of conditions, such as wheel rotation, wheel vibration caused by skidding, and specific electromagnetic and/or magnetic signals indicative of particular wheel locations. The sensor circuitry is coupled to an RF transceiver, which may but need not be included within the wheel. The wheel may also include a brake mechanism. In one embodiment, the wheels are placed on shopping carts and are used to collect and monitor shopping cart status and location data via a wireless network. The collected data may be used for various purposes, such as locking the wheel of an exiting cart if the customer has not paid, estimating numbers of queued carts, stopping wheel skid events that occur during mechanized cart retrieval, store planning, and providing location-based messaging to customers.

Abstract: A mobile platform such as a shopping cart, flatbed cart or lift truck is provided with a plurality of radiation detectors which are screened or limited in scope of view and which cooperate with circuitry which can distinguish from the interaction of the sensors with emitters the position of the platform. Position consists of location and orientation. Each detector or sensor is screened to limit its view to a defined portion of a sphere.

Abstract: A shopping cart conveyor that inhibits the loading of a non-compliant shopping cart onto the conveyor. In one aspect, the invention provides a conveyor comprising a track operable to guide the shopping cart between a first location and a second location, a gate assembly including a door movable between a closed position inhibiting entry to the track and an open position allowing entry to the track, a lock for securing the door in the closed position, and a sensor (e.g., an ultrasonic sensor, an optical sensor, a radar sensor, an infrared sensor, an RFID reader, a magnetic sensor, and a mechanical sensor) positioned to detect the presence of a shopping cart. In another aspect, the conveyor is configured to move the gate from the closed position to the open position when the sensor detects the presence of a shopping cart. Preferably this is done using a drive mechanism coupled to the gate.

Abstract: A media enhanced shopping cart system comprises a shopping cart comprising a frame, a basket, a handle, a base tray, a plurality of wheels, a read component for performing a proximity scan of the shopping cart, a locationing component for determining a location of the shopping cart within a store based on the scan, and a display component for displaying at least one advertisement for a product based on the location of the shopping cart within the store, wherein the locationing component is further operable to determine a location of the product within the store relative to the shopping cart based on the scan, and wherein the display component is further operable to display an indication of the location of the advertised product relative to the location of the shopping cart.

Abstract: A locking system for stopping a shopping cart includes a caster that can be selectively disabled when the cart encounters an electronic barrier. The caster includes a brake that is mounted on the frame of the caster. Also mounted on the frame are two receivers for separately receiving different signals from an electronic barrier. Respective decoders on the frame decipher lock commands in the signals, and a controller selectively activates the brake to prevent further movement of the cart in response to the lock commands. The electronic barrier can include an underground loop antenna and an above-ground RF beacon.

Abstract: A security system and method of providing security in a retail environment or the like, comprising shopping trolleys associated with the retail enviroment fitted with security devices having a receive-only wireless receiver and a processor. The receiver receiving wireless signals transmitted from one or more transmitters located at various locations around the retail enviroment. By analyzing the wireless signals as it passes thereby, the processor of the security device may determine a location and/or a direction of travel of a shopping trolley to which it is fitted. In addition, an alarm signal may be raised if a predetermined signal or sequence of signals is detected.

Abstract: A security device for a transport vehicle for inhibiting the unauthorized removal of the vehicle from a designated use area comprises a mechanism for inhibiting forward movement of the vehicle, a sensor assembly for (a) detecting an attempted removal of the vehicle from the use area and generating a corresponding trigger signal, and (b) detecting a predetermined corrective action and generating a corresponding reset signal, and an actuator in communication with the sensor assembly for receiving the trigger signal and reset signal and activating and deactivating the mechanism respectively.

Abstract: Embodiments of the invention address deficiencies of the art in respect to bottom of the basket (BOB) item detection and provide a method, system and computer program product for high-contrast BOB item detection. In one embodiment of the invention, a shopping cart BOB item detection data processing system can include high contrast material applied in proximity to a shopping cart BOB; an optical sensor positioned to generate an image of the high contrast material; BOB detection logic and an alert disposed in proximity to a cash register at the check stand. The BOB detection logic can include program code enabled to analyze the image to detect either an obscuring ir an obstruction of the high contrast material. As such, the alert can be operable to issue an alert responsive to the BOB detection logic detecting one an obscuring or an obstruction of the high contrast material.

Abstract: A mobile platform such as a shopping cart, flatbed cart or lift truck is provided with a plurality of radiation detectors which are screened or limited in scope of view and which cooperate with circuitry which can distinguish from the interaction of the sensors with emitters the position of the platform. Position consists of location and orientation. Each detector or sensor is screened to limit its view to a defined portion of a sphere.

Abstract: The inventions involve material handling apparatus developed to operate in radio frequency rich environments. Articles are provided having at least one large compartment capable of enclosing at least one electronic device or a package populated with a plurality of devices. RFID tags are also provided having three antenna arrays situated on three planes to improve electromagnetic and electrostatic coupling with an external distributed network of devices. Pallets are provided with cellular communications devices to provide track and trace functionality. Sensors and actuators are used in connection with the material handling apparatus.

Abstract: Containers such as shopping carts and shopping baskets take advantage of fraud detection systems in place with RFID cash registers in stores. The weight of the container is obtained when entering the store and the weight of the shopped articles is correlated with the list of the articles detected by the RFID reader of the cash register. Recognizing a particular container in the store is done using RFID technology with an RFID tag integrated in the structure of the container. The RFID tag can also contain information such as the weight, size, color, type, form, etc. of container.

Abstract: An RFID-based system for tracking, managing, dispensing and recycling bags, particularly retail and grocery-type bags such as t-shirt bags and the like. The preferred embodiment of the present invention contemplates a system wherein there is employed at a T-Shirt bag fabrication facility an RFID tag dispensing system for affixing an RFID tag to the thermoplastic film utilized in forming a T-shirt bag, which bag is formed into a stack. The RFID tag is associated with the bag at the time of manufacture, and information pertaining to said bag is saved in a central computer, which is subsequently used in shipping and management of the bag(s). A sensor bag rack is provided for supporting the bag pack during dispensing and use of the bags at the checkout counter, which supports the bag during loading and is configured to relay data on said bag as it is removed from the rack for placement in the customers cart, or otherwise provided to the customer.

Abstract: The present invention teaches and discloses method and apparatus for alerting a grocery store check out cashier of merchandise placed on the bottom tray of a typical grocery shopping cart. A passive RFID transponder is incorporated into the structure of the cart which when interrogated by an associated reader, located at the cashier's check out station, responds with a signal verifying the presence, or absence, of an unseen item upon the carts bottom tray.

Abstract: A system and a method for detecting and rewarding the return of supermarket carts or luggage carts taken from a cart stand. Each cart is provided with a contactless, preferably optically identifiable, individual mark, by which the cart is identified when it is returned to a cart stand. In addition, the identifying mark on the cart changes when the cart is brought back to the cart stand, from an active state, in which the mark can be identified, to a passive state, in which the mark cannot be identified, or vice-versa. In addition to the presence of a returned cart, the invention enables the correct positioning of a cart in a row of nested carts to be identified in a contactless and automatic manner.

Abstract: A hand-operated cart constructed for carrying luggage or packages includes a frame including a cargo area, and cart wheels connected to the frame and connected to a handrail arranged for manually displacing the cart. The cart also includes a distance sensor constructed and arranged to measure a travel distance of the cart, an interface unit and a processor constructed to receive travel distance data from the distance sensor.

Abstract: A location-based service includes detecting the relative motion of an on-site resource, such as a shopping cart, in addition to detecting the absolute position of the on-site resource, and displaying information on the on-site resource. The displayed information is based upon the detected relative motion and the detected absolute position. The relative motion is tracked and a position on a floor plan is deduced. This deduced position is adjusted, for example, synchronized or reset, as a function of and in response to the detected absolute position.

Abstract: A device for interacting with an interface surface provided on a substrate, the interface surface including coded data disposed therein or thereon. The device includes at least one sensor for sensing at least some of the coded data and a processor for generating first data using the sensed coded data. The first data is indicative of an identity of the interface surface and a position of the device relative to the interface surface, and is transferred to a computer system by a transmitter. The computer system uses the first data to determine a page description, and from this display data indicative of information to be printed. The display data is transferred to the device to allow the device to present information relating to the display data.

Abstract: A control center continuously monitors a security state of a container through an extended network spanning from a shipper to a consignee. The control center changes the security state responsive to explicit information received from a trusted agent, or implicit information deducted from business logic. A trusted shipper agent sends manifest information from a shipper checkpoint to the data center that includes, for example, container information, shipping route information, and other security information. Trusted monitor agents continuously track the security state from the shipper checkpoint to the origin checkpoint, from the origin checkpoint to a destination checkpoint, and from the destination checkpoint to a consignee checkpoint. A trusted consignee agent sends termination information from the consignee checkpoint to the data center.

Abstract: The method for identifying the presence of an item to a user interface entails using a container having a loading opening and a collection opening, passing the item through the loading opening activating a first sensor, sending a first signal from the first sensor to an intelligent device, creating a first intelligent device signal from the intelligent device, communicating the first intelligent device signal to a communication system, opening the collection opening to collect the item, thereby activating a second sensor, sending a second signal from the second sensor to the intelligent device, creating a second intelligent device signal from the intelligent device, communicating the second intelligent device signal to the communication system, and using a software interface to process the first intelligent device signal and the second intelligent device signal and present the intelligent device signals processed by the software interface to the user interface.

Abstract: Card-type anti-miss/anti-theft alarm device including a portable mainframe and an alarm sub-frame each having a central processing/controlling unit and a power supply unit. One of the portable mainframe and alarm sub-frame includes an intermittent oscillating transmission unit, while the other includes a signal receiving unit and a sonic/optical warning unit. The alarm sub-frame is designed as a thin card with a dimension smaller than or equal to that of an existent credit card, whereby the alarm sub-frame can be easily placed and hidden in an article carried by a user. In case the user misses the article or the article is stolen by a thief and spaced from the user by a certain distance, at least one of the portable mainframe and the alarm sub-frame can emit an alarm to indicate the user of the location of the missing article. Accordingly, the user can easily find the article and the thief is scared.

Abstract: A system and method is disclosed for a shopping system, the system including a shopping cart including a plurality of wheels; a portable electronic device (e.g., a CST or POS terminal), coupled to the shopping cart, for displaying shopping data; and a position mapping system, coupled to the electronic device, for developing a shopper location relative to a start location, the mapping system including a distance measuring system, coupled to one of the plurality of wheels; for providing a distance signal indicating a distance of movement of the shopping cart; and a direction measuring system for providing a direction signal concurrent with the distance signal. Another embodiment is a shopper tracking system including a shopping cart having a plurality of wheels; a portable electronic device, coupled to the shopping cart, for displaying shopping data; and an energy generator, coupled to one of the plurality of wheels, for adding energy to a power source of the portable electronic device.

Abstract: An alert notification system for customers and sales personnel in a shopping area and a method of use is disclosed. In a first aspect, a system for alerting customers and sales personnel that merchandise has been left in a shopping area is disclosed. The system comprises a merchandise detector for detecting merchandise purchased by a customer and a customer detector for detecting whether the customer has left the merchandise. The system further includes a notification system responsive to the customer and merchandise detectors for alerting the customer when the customer has left the purchased merchandise. In a second aspect, the method comprises detecting the presence of merchandise associated with a customer via a second detector and detecting whether the customer has left the merchandise via a second detector. The method further includes alerting the customer, responsive to the first and second detectors, via a notification mechanism if the customer has left the merchandise.

Abstract: A mobile retail signage management system includes a communication device capable of transmitting a specific location for which a corresponding sign needs to be positioned at the specific location; a portable workstation including a product database that associates product information with the specific location, wherein the product information includes display information for a corresponding sign positioned at the location. Moreover, the portable workstation communicates to the communication device as the portable workstation comes within the communication range of the communication device, wherein the communication range corresponds to the near vicinity of the portable workstation with respect to the communication device. A sign writer for imaging the corresponding sign in real-time, in the near vicinity of the specific location; and a computer network for updating the database are provided.

Abstract: A system for detecting and rewarding the return of shopping carts to collection points is provided. A signal corresponding to a dividend is generated as soon as a shopping cart is returned to a collection point. The signal is only generated when the shopping cart is returned correctly to a row of shopping carts. The correct return of the shopping carts is monitored by a digital image processing camera or with an optical signal transmitter which cooperates with evaluation units disposed on the shopping cart.

Abstract: A shopping receptacle, the shopping receptacle being adapted to receive and retain a product item, the product item having an interface surface associated therewith, the interface surface having disposed thereon or therein coded data including a plurality of coded data portions, each coded data portion being indicative of an identity of the product item, wherein the receptacle comprises:

Abstract: An apparatus is provided for detecting a shopping cart used to bring items to a checkout location, and inspecting its bottom tray for the presence of items. The apparatus includes a cart-detector to detect the presence of the cart at a pre-determined location; and an item-detector to detect the presence of items placed on the lower tray of the cart. The cart detector includes an arrangement of three optical sensors and corresponding retro-reflective targets; and finite state-machine processing logic to discriminate a specific sequence of sensor responses.

Abstract: A bag includes an upright bag body with a rectangular mouth portion confined by opposite longer walls and opposite shorter walls. At least one of the longer walls is formed with first strap holes therethrough. A carrying strap has opposite sections extending respectively through the first strap holes and formed with a respective retaining end for connecting the carrying strap to the bag body. A backing plate is disposed to lie against one of the longer walls, and is formed with second strap holes that permit extension of the carrying strap therethrough. A sound generating module has a frame unit mounted on the backing plate, and a data storage unit and an audio playback unit mounted on the frame unit. The audio playback unit is coupled to the data storage unit and is operable so as to audibly reproduce audio information stored in the data storage unit.

Abstract: A cashierless shopping store includes a plurality of shopping carts into which selected items to be purchased are placed by shoppers. Each of the shopping carts includes a weight detector to measure the weight of items placed therein and a transmitter to transmit the measured weights over a wireless communications link. A portable wireless shopping terminal accompanies each of the shopping carts. Each shopping terminal reads item price and item weight data from each selected item to be purchased and receives the measured weight of each selected item transmitted over the wireless communication link by the transmitter. The shopping terminal compares the read item weight data with the transmitted measured weight to determine if the read item weight data and the transmitted measured weight for each selected item correlate.

Abstract: An apparatus is provided for detecting a shopping cart used to bring items to a checkout location, and inspecting its bottom tray for the presence of items. The apparatus includes a cart-detector to detect the presence of the cart at a predetermined location; and an item-detector to detect the presence of items placed on the lower tray of the cart. The cart detector includes an arrangement of three optical sensors and corresponding retro-reflective targets; and finite state-machine processing logic to discriminate a specific sequence of sensor responses.

Abstract: A hand-operated cart constructed for carrying luggage or packages includes a frame including a cargo area, and cart wheels connected to the frame and connected to a handrail arranged for manually displacing the cart. The cart also includes a distance sensor constructed and arranged to measure a travel distance of the cart, an interface unit and a processor constructed to receive travel distance data from the distance sensor.

Abstract: An infrared detection and alarm system for the bottom shelf of shopping carts having attached to the bottom shelf an infrared emitter which shall emit therefrom infrared light which shall be received by an infrared detector when no merchandise is located on the bottom of the cart and if a piece of merchandise is located on the bottom shelf the light shall be interrupted. Upon interruption of the light, a transmitter shall communicate a code to a receiver mounted on the checkout stand at which point said receiver shall activate an LED warning light to communicate to the sales clerk the presence of merchandise on the bottom shelf of the shopping cart.

Abstract: An anti-theft vehicle system for a vehicle wheel having a rotational axis including a signal generator to generate a first predetermined signal around a first predetermined perimeter and to generate a second predetermined signal around a second predetermined perimeter at least partially disposed within the first predetermined perimeter, at least one inhibitor disposed within the vehicle wheel to selectively engage and disengage the vehicle wheel to resist and allow rotational movement of the vehicle wheel about the rotational axis, a rotatable structure disposed within the vehicle wheel and cooperating with the at least one inhibitor for moving the at least one inhibitor between an engaged position and a disengaged position with respect to the vehicle wheel, and a receiver disposed within the vehicle wheel to receive a first predetermined signal and second predetermined signal to activate the rotatable structure to move the at least one inhibitor between the engaged position and the disengaged position.

Abstract: An anti-theft vehicle system for a vehicle wheel having a rotational axis includes at least one inhibitor disposed within the vehicle wheel to selectively engage and disengage the vehicle wheel to resist and allow rotational movement of the vehicle wheel about its rotational axis. The anti-theft vehicle system also includes rotatable structure disposed within the vehicle wheel and cooperating with the at least one inhibitor for moving the at least one inhibitor between an engaged position and a disengaged position with respect to the vehicle wheel. The anti-theft vehicle system further includes a receiver operatively associated with the vehicle wheel to receive a predetermined signal to activate the rotatable structure to move the at least one inhibitor between the engaged position and disengaged position.

Abstract: A system and method for tracking and recognizing merchandise items taken into a fitting room by a customer for providing more efficient customer assistance. Each merchandise item is attached to a wireless tag including a product identifier. A fitting room is equipped with an antenna/receiver unit which interruates the wireless tag of an item taken into the fitting room to be tried-on. A store server retrieves information about the item based on the product identifier, and presents such information to a store clerk through an in-store terminal. In addition, the server develops recommendation of other products that the customer might be interested based upon the items taken into the fitting room. The server includes an analysis and recommendation engine that analyses the style, color, and brand of each of the items in the fitting room, and develops recommendations accordingly. The server presents the recommendations to a store clerk via the in-store terminal.

Abstract: A security system for use in supermarkets and other retail outlets comprises a plurality of shopping carts and at least one point of sale terminal 10. Each point of sale terminal 10 comprises a transmitter 14 which provides an adjacent cart 13 with an electronic token once the goods in the cart have been paid for.

Abstract: An anti-theft system for a shopping cart comprises a collapsible front suspension mounted between the front side members of a base frame of the shopping cart, the front suspension including a support, a first set of casters mounted to the support, retractable pin means carried by the support and engagable with the side members of the base frame for maintaining the front suspension in an operative mode in which the first set of casters engage a supporting surface, a sensor for detecting a first external signal, apparatus functionally coupled to the sensor for transmitting an activation signal to the retractable pin means to cause retraction of the pin means and render the front suspension inoperative, and a second set of casters fixed to the base frame for preventing the cart from moving in a linear direction, when the front suspension is rendered inoperative.

Abstract: A construction of packaging such as an envelope is disclosed that comprises a wall surrounding contents of the packaging and electrically conductive tracks extending over the wall. An electronic control device is mounted to the wall and includes a plurality of output ports to which one end of each conductive track is connected and an input port to which an opposite end of the conductive tracks are connected. The control device outputs from the output ports pulses which are distinguished from one another and monitors the input port for receipt of these pulses to provide an indication of integrity of the wall of the package.

Abstract: In a returning system for service carts (24), said system comprising electronic monitoring of the movement of the carts (24) through an activity area, the main novel features are a) that the returning system is an electronic system operable in a deposit-free manner, the elements of said system being mutually related in a compulsorily activating manner from a collection station, at which the carts stand in readiness to be collected, and via an activity area again back to a readiness collection station, b) that the system comprises an electronic signal director (20) that is both controllable and/or controlling and comprises fixed and variable functions, c) that the system further comprises, c1) mobile electronic communication devices (28) intended and constructed for placement on the system's service carts (24) so as to accompany the latter, each of said communication devices (28) being adapted for electronic identification of the particular service cart on which it is placed, and c2) stationary electronic