Intercom calling apparatus in a key telephone system

Details Intercom calling apparatus in a key telephone system Intercom calling apparatus in a key telephone system

1978-04-17

1979-11-20

Claffy, Kathleen H.

179 18BF, H04M 172

Patent

active

041752163

ABSTRACT:
An intercom calling apparatus in a key telephone system including a page switch for switching the transmitter from a talking circuit network to an intercom calling path while a contemporaneous call on a central office line is held by the series combination of a resister and a varistor forming a parallel circuit with the transmitter in the talking circuit network.

REFERENCES:
patent: 3872261 (1975-03-01), Shinoi et al.
patent: 3904834 (1975-09-01), Shinoi et al.
patent: 3927278 (1975-12-01), Tsutsumi et al.
patent: 4001517 (1977-01-01), Bidlack et al.
patent: 4002857 (1977-01-01), Herlacher
patent: 4032724 (1977-06-01), Matheny
patent: 4079212 (1978-03-01), Sasai

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