Abstract: The invention relates to a device that can read numerical information from a credit card, interfaced with a general purpose digital computer for automatic credit card validation and/or dialing approaches to include through the computer charge and billing information in conjunction with the credit card utilized. The entire system is automatic and eliminates telephone operator intercept. It can be utilized in conjunction with an automatic telephone dialing equipment. There are unique characteristics in the credit card itself which might be either visual, mechanical, or magnetically validated, and wherein the validation equipment preferably has no moving parts to eliminate breakdown problems.

Abstract: A device for monitoring the heartbeat of an individual at a pulse point. Fundamentally, the invention comprises two piezoelectric sensors arranged in close parallel relationship with each other and differentially connected to an amplifier circuit. One of the sensors lies over the pulse point of the individual while the other lies therebeside. A rate detector receives the amplified outputs of the sensors and determines the pulse rate from the heart. If this rate exceeds a predetermined level, a signal is passed to enable an oscillator of audible frequency; the output of the oscillator being connected to any earphone speaker to produce a warning sound.