Communication system

Details Communication system Communication system

1979-11-19

1982-05-11

Popek, Joseph A.

179 99A, H04M 908

Patent

active

043295436

ABSTRACT:
A communication system for combining telephone service with hands-free talk-back intercom service is disclosed. The telephone service includes a telephone exchange network having an outside trunk, an internal trunk, and a device for switching the telephones within the system between either the outside trunk or the internal trunk in response to appropriate signals from the telephones. The intercom network generally includes a main distribution station associated with various telephones and transducers. Various embodiments of the system, having differing numbers of the above elements, are disclosed.

REFERENCES:
patent: 3304376 (1967-02-01), Truby
patent: 3743791 (1973-07-01), Duff et al.
patent: 3976847 (1976-08-01), Bidlack et al.

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