Control circuit for a telephone system for the control of...

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

H - Electricity

04

M

344/13, 379/33

H04M 3/42 (2006.01) H04Q 3/52 (2006.01)

Patent

CA 1150804

S P E C I F I C A T I O N "CONTROL CIRCUIT FOR A TELEPHONE SYSTEM FOR THE CONTROL OF VISUAL AND AUDIBLE SIGNALS" ABSTRACT OF THE DISCLOSURE 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. -i-

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