Control circuitry for key telephone apparatus

Details Control circuitry for key telephone apparatus Control circuitry for key telephone apparatus

H - Electricity

04

M

379/33, 379/57,

H04M 1/72 (2006.01) H04M 3/22 (2006.01) H04M 9/00 (2006.01) H04Q 1/30 (2006.01)

Patent

CA 1061488

ABSTRACT The disclosure is for key telephone system line control circuitry which provides telephone station line status signals for central office ring, busy, idle and station hold conditions by means of a single control line.

270956

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