Electronic key telephone system

Details Electronic key telephone system Electronic key telephone system

1978-12-26

1980-11-25

Brigance, Gerald L.

179 99P, 179 18GF, H04Q 520

Patent

active

042360498

ABSTRACT:
A key telephone system includes among other things a central switching network comprises of a main switch matrix including main talking paths and trunk paths, an auxiliary switch matrix including auxiliary talking paths and a coupling matrix between the main and auxiliary switch matrices and in which system each of the telephone station sets can talk through a plurality of talking paths, concurrently, and is capable of talking back hand-free.

REFERENCES:
patent: 3647980 (1972-03-01), Fabiano, Jr. et al.
patent: 3743791 (1973-07-01), Duff et al.
patent: 3976847 (1976-08-01), Bidlack et al.
patent: 4063047 (1977-12-01), Huryn
patent: 4158112 (1979-06-01), Cerbone et al.

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