Pay telephone unit

Details Pay telephone unit Pay telephone unit

1992-08-27

1993-12-14

Douglas, Alan P.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Telephone equipment

Patent

active

D03422518

REFERENCES:
patent: D301036 (1989-05-01), Yamazaki et al.
patent: D302273 (1989-07-01), Adachi et al.
patent: D302691 (1989-08-01), Rose
patent: D304190 (1989-10-01), Rose
patent: D304725 (1989-11-01), Rose
patent: D305653 (1990-01-01), Rose
patent: D315485 (1991-03-01), Schremmer et al.
Teleconnect, Mar. 1988, p. 135, Landis & Gyr Phonocard.

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