Communication systems of key telephone systems

Details Communication systems of key telephone systems Communication systems of key telephone systems

1975-03-13

1976-09-07

Claffy, Kathleen H.

179 1HF, 179 1VC, 179 81B, H04M 160

Patent

active

039795632

ABSTRACT:
In a communication system of a key telephone system wherein a key telephone selected by electric power supplied from a key service unit is started through a signal line for performing an independent calling, the key service unit is provided with a voice switch adapted to switch between transmission and reception of speech, each key telephone is provided with answer signal sending means including a microphone, and a common line is connected to the outputs of the answer signal sending means of respective key telephones for sending the outputs to the voice switch, thus permitting a selected key telephone to perform a hand-free communication.

REFERENCES:
patent: 2892033 (1959-06-01), Corrigan
patent: 3055979 (1962-09-01), Shimizu
patent: 3126448 (1964-03-01), Millett
patent: 3743791 (1973-07-01), Duff et al.
patent: 3860756 (1975-01-01), Shinoi et al.
patent: 3872262 (1975-03-01), Kerman

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