Arthur D. Little, Inc.

Dasa LLC

Richard A Brisk

Robin C Moseley

For use in a telephone repertory dialer in which telephone number data is stored on a magnetic recording surface, logic circuitry for entry of telephone number data onto the recording surface or for readout of data from the recording surface for dialing out a telephone number. The logic includes an electronic memory for storing a single telephone number and through which all telephone number data is conveyed for both recording and readout.

Repertory dialer logic

A digital light responsive switching circuit in which a plurality of photosensors are respectively responsive to different sources of illumination and in which the electrical input channels are independent and each operative to provide digital output signals representative of sensed illumination levels.

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Arlington, MA, United States of America

Richard A Brisk