Paging intercommunication system

Details Paging intercommunication system Paging intercommunication system

1974-08-20

1976-03-02

Claffy, Kathleen H.

H04M 1300

Patent

active

039419339

ABSTRACT:
Intercommunication between a plurality of stations is established through a pair of signal lines to which portable units are connected, each unit having its own power supply contributing to a low DC operating voltage maintained across the signal lines through which the audio signals are also conducted. Communicate and pager switches associated with each unit respectively control signal connections, d.c. line-voltage level, and signal input impedance for establishing intercommunication and paging functions.

REFERENCES:
patent: 2087027 (1937-07-01), Glaser
patent: 3041411 (1962-06-01), Beatty
patent: 3783195 (1974-01-01), Day

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