Abstract: A set of battery jumper cables includes a pair of single pole, single throw switches, or equivalent semiconductor implement switches. The switches are connected in series between the battery connection terminals of each cable in the set to prevent arcing. Control wires and a delay circuit connect the two terminals at one end of the set to the operating coil of one of the single pole switches. Similarly, another set of control wires and a delay circuit connect the terminals at the other end of the set to the operating coil of the other switch. In operation, these two switches in their unenergized state are open and automatically current flow through the cable set until after all four cable terminals are connected respectively to battery terminals and the relay delay has timed out, thus preventing arcing as the terminals are connected and disconnected or if the terminals at one end are shorted to each other.

Abstract: A plurality of data entry terminals is connected to a microprocessor system which analyzes terminal data for display on a production CRT, intended to be located in a restaurant kitchen. Food items entered on the terminal are displayed with a corresponding symbol denoting a work station where such food item is to be prepared. As each item is prepared, the food preparer enters a display symbol to signify its completion. Upon completion of all items in a food order, the microprocessor system erases the order from the CRT. A separate CRT may be connected to the microprocessor system for use by a food expediter. As each order is completed by the food preparers, the order is visually displayed on the expediter CRT thereby alerting the food expediter to collect the items of an order in the kitchen so that they may be picked up by a waiter.

Abstract: Circuitry receives data information from a wand and decodes the same for duplicating a keyboard input to a display. The interface circuit includes a plurality of switches paralleling the keyboard input switches and generates autonomously a control signal indicative of a status of the display.