Telephone system

Details Telephone system Telephone system

1980-04-29

1982-04-27

Brigance, Gerald L.

179 99M, 179 18FA, H04Q 520

Patent

active

043272568

ABSTRACT:
An electronic key telephone system in which three or more key telephone instruments are interconnected or connected to an exchange line, as required, by way of a central control unit, each instrument being connected to the central unit by means of two speech wires and two signalling and control wires, an adaptor unit is provided to enable connection of an external extension telephone to the central unit by way of a single pair of wires.

REFERENCES:
patent: 3789152 (1974-01-01), Medill et al.
patent: 3914559 (1975-10-01), Knollman
patent: 3996424 (1976-12-01), Agricola
patent: 4088844 (1978-05-01), Kinnaird, Jr. et al.
patent: 4088846 (1978-05-01), McEowen
patent: 4125748 (1978-11-01), Nahabedian et al.
patent: 4160131 (1979-07-01), Kaul et al.
patent: 4220827 (1980-09-01), Burke et al.
"Novakey Data Controlled Key System", F. J. Howett, Electrical Communication, vol. 52, No. 4, 1977, pp. 293-298.

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