Control circuit for a telephone system for the control of visual

Details Control circuit for a telephone system for the control of visual Control circuit for a telephone system for the control of visual

1979-07-18

1981-05-05

Konick, Bernard

H04M 302

Patent

active

042661013

ABSTRACT:
A telephone switching system, such as a private branch exchange, incorporates a centrally controlled control unit for controlling operation of visual and audible station instrument display device, without interfering with the voice communication line circuits, and without requiring external circuits and equipment.

REFERENCES:
patent: 2884491 (1959-04-01), Breen
patent: 4105875 (1978-08-01), Schneider et al.
patent: 4140882 (1979-02-01), Regan et al.

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