Telephone exchanger

Details Telephone exchanger Telephone exchanger

1990-01-08

1991-04-30

Fay, Jr., Horace B.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

D14151, D14150, D14142, D14248

Patent

active

D03165523

REFERENCES:
patent: D225233 (1972-11-01), Janda et al.
patent: D280404 (1985-09-01), Inaba
patent: D282545 (1986-02-01), Inagi et al.
patent: D298132 (1988-10-01), Hickling
patent: D303798 (1989-10-01), Yamakawa
patent: D303966 (1989-10-01), Fritzsche
patent: D304564 (1989-11-01), Kido et al.
patent: D304727 (1989-11-01), Barker et al.
patent: D307145 (1990-04-01), Oshima et al.
patent: D308680 (1990-06-01), Raggi et al.
patent: D310524 (1990-09-01), Utsuki et al.

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