Key telephone system with directly associated station cards and

Details Key telephone system with directly associated station cards and Key telephone system with directly associated station cards and

1974-09-26

1976-08-03

Claffy, Kathleen H.

H04Q 518

Patent

active

039730859

ABSTRACT:
A telephone system comprises a plurality of station sets, each including a plurality of key buttons, and the system includes

REFERENCES:
patent: 3098215 (1963-07-01), Waite
patent: 3385935 (1968-05-01), Anderson et al.
patent: 3420961 (1969-01-01), Averill, Jr.
patent: 3489853 (1970-01-01), Lang
patent: 3519757 (1970-07-01), Anderson et al.
patent: 3549820 (1970-12-01), Knollman
patent: 3604857 (1971-09-01), Opferman
patent: 3787631 (1974-01-01), Lewis
patent: 3843845 (1974-10-01), Ridley

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