Abstract: A decorative smoke detector construction which includes a smoke detector for mounting on a wall or ceiling of a room and which includes a decorative plaque mounted thereon which conceals the smoke detector from view and which includes structure for permitting communication of the smoke detector with smoke which may exist in the room. A kit for teaching fire safety including a package containing a decorative smoke detector construction as described above, and instructional literature which is especially attractive to children for teaching fire safety.

Abstract: A penetration sensor is disclosed which contains first and second transducers sandwiched around a layer which capacitively isolates the individual transducers. This sensing arrangement allows for the operational state of the sensor to be tested by applying an interrogation signal to each of the transducers.

Abstract: A foldable, warning triangle includes illuminating and audible alerting indicators to warn oncomers of vehicular accidents and other danger conditions. Flashing lights may be powered from self-contained batteries or from an external source such as an automobile battery and the flashing rate may be set by an internal timing circuit or may be derived from the collision-avoidance lamp of an automobile.

Abstract: An anti-theft sensor marker is disclosed which has good sensitivity characteristics and which does not readily deteriorate due to bending stress. The marker is mainly composed of an alloy ribbon and is employed in an anti-theft system in which the stealing of a commodity previously marked by the marker is determined by detecting a magnetic field of a specific frequency with respect to an incident magnetic field intensity applied to a detection region through the alloy ribbon of the marker when the marker is disposed within the detection region.

Abstract: A paging system comprising a centrally located terminal and a plurality of remote pager units is disclosed wherein both automatic and manual acknowledge back signalling is provided. An appropriate acknowledge back signal by a called pager within a set interval indicates the message was duly receivied and understood which is so indicated to the initiating caller. Failure to respond within the set interval causes the pager unit to send back a negative response which is likewise so indicated to the initiating caller.

Abstract: A theft protection system for an installation unit recessed in an installation passage protects the installation unit mechanically and by an electrically initiated alarm by permitting the installation to be pulled out of the installation passage to a distance limited mechanically by a movable protection stop and by actuating an electrical theft protection contact within this distance by utilizing the relative motion between the installation unit as an installation retention arrangement and the installation passage to initiate the alarm.

Abstract: A security system includes a display for displaying user prompts to select from a set of alternative options for controlling the system, so that the user may respond by selecting one of the options. If further information is necessary, second and subsequent sets of options are displayed for user selection. If an authorization code is required, a prompt for an authorization code is displayed. The sets of options are preferably displayed adjacent a keypad, so that an option may be selected by actuating the key adjacent the selected option. Sequences of commands need not be memorized by a user, and complicated keyboards are not required to control the security system.

Abstract: A belt is provided for horizontally encircling and support from a human body portion and the belt is constructed of water impervious material and includes relatively insulated longitudinally extending internal first and second relatively insulated conductors. First and second sets of electrical contact members are provided and are electrically connected to the first and second conductors, respectively, and the contact members include portions thereof exposed relative to the outer side of the belt. The outer side of the belt includes downwardly opening housing portions of water impervious material disposed over the exposed portions of the contact members and each housing portion includes a vent opening therein for venting trapped air therefrom.

Abstract: This invention relates to a deactivatable tag useable with an electronic article surveillance system and comprised of planar conductive material cut into a pair of inverse, first and second spiral conductors wrapped about each other and positioned for capacitive and inductive coupling. The invention also relates to method of making tags wherein conductors are cut from a planar web of conductive material in a continuous process in a manner that the cutting results in the formation of two spiral conductors without accompanying waste of conductive material, and thereafter positioning the conductors to provide resonant circuits. The conductors of each pair are connected by welding to provide a reliable circuit. A film of electrostatic-charge-draining material on a web of deactivatable tags prevents their premature deactivation.

Abstract: An aural or visual alarm is arranged to be actuated upon leaving a door to an appliance open longer than a preselected period of time. An automatically resettable disarming device may be included to permit leaving the door open intentionally for an extended time to permit appliance cleaning or the like.