High security telephone instrument

Details High security telephone instrument High security telephone instrument

1991-03-22

1992-10-13

Fay, Jr., Horace B.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Telephone equipment

Patent

active

D03302091

REFERENCES:
patent: D156347 (1949-12-01), Kirshner
patent: D183985 (1958-11-01), Hose
patent: D277480 (1985-02-01), Gackwicz et al.
patent: D290954 (1987-07-01), Read
patent: D299341 (1989-01-01), Yachabach
patent: D302814 (1989-08-01), Rose
patent: D303525 (1989-09-01), Stewart
patent: D305332 (1990-01-01), Schremmer et al.
patent: D315485 (1991-03-01), Schremmer et al.
patent: D318469 (1991-07-01), Joffe et al.
patent: 4837814 (1989-06-01), Yoshino et al.
Pose. Off. Telecommun. J. (G.B.); vol. 3, No. 31, Fall 1979, Article & Pictures; New Payphone Take The Credit; by L. L. Grey.

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