A system for verifying the credit of a customer at the point of sale is described which uses a standard credit card including a magnetic stripe on which the customer''s identification number is recorded in dual tone form similar to the ''''touch-tone'''' system used by the telephone company. A small unit is located right at the point of sale, for example, on the counter of a retail store or adjacent the gasoline pumps of an automobile service station. When the card is inserted into the unit, the unit automatically dials the telephone number of the credit card company''s central computer. When a connection has been made, the credit card is drawn along a simple magnetic read head which generates an audio signal which is coupled to the telephone line directly without the necessity for any encoding or decoding or alteration in form. The receipt of these tones by the computer constitutes an interrogation whereupon the computer checks the customer''s credit and generates an appropriate signal, preferably in the form of one or more audio tones, and returns it to the unit which displays the results by illuminating a suitable lamp which indicates that credit is approved or that credit is denied or that the merchant should pick up his telephone for other instructions.

Credit verifying unit

Automatic telephone dialing and message delivery system

A robbery-repelling alarm system includes a shouting alarm which will produce a human warning speech prerecorded in a first cassette tape for efficiently repelling intruders; a car lock which will be actuated by intruder to ground the current of the engine ignition coil to prevent the car starting; and a telephone dialing alarm including both a pulse dialer and a prerecorded message alarm operated by a second cassette tape for easier operation and minor cost

Robbery-repelling alarm system

Communication switching adapter

Automatic telephone alarm system

Automatic telephone dialing apparatus

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Automatic telephone dialing apparatus

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Credit verifying unit

Automatic telephone dialing and message delivery system

Robbery-repelling alarm system

Communication switching adapter

Automatic telephone alarm system

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