Key telephone system and method

Details Key telephone system and method Key telephone system and method

1977-05-16

1978-09-05

Claffy, Kathleen H.

179 18J, H04M 100

Patent

active

041122615

ABSTRACT:
An improved key telephone system realizes substantial reduction in installation costs, permits use of relatively small central units, provides compatability with telephone apparatus speaker phones, automatic dialers, etc., and provides additional advantages. The system basically embodies:

REFERENCES:
patent: 3701854 (1972-10-01), Anderson et al.
patent: 3701855 (1972-10-01), Reynolds
patent: 3843845 (1974-10-01), Ridley
patent: 3935396 (1976-01-01), Barsellotti et al.
patent: 3973085 (1976-08-01), Shiff
patent: 4061887 (1977-12-01), Kasson et al.

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