Attendant telephone switchboard

Details Attendant telephone switchboard Attendant telephone switchboard

1987-05-19

1989-11-14

Fay,, Jr.,

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Telephone equipment

D14241, D14248, D14142, D14150, 379440

Patent

active

D03045641

REFERENCES:
patent: D243619 (1977-03-01), Olsson
patent: D266667 (1982-10-01), Bee
patent: D268181 (1983-03-01), Banko
patent: D268265 (1983-03-01), Gibson
patent: D279900 (1985-07-01), Topp
patent: D284193 (1986-06-01), Marshall
patent: D285921 (1986-09-01), Beese
patent: D287011 (1986-12-01), Kakin
patent: D298130 (1988-10-01), Komatsu
patent: D299131 (1988-12-01), Asaki et al.
patent: 4278845 (1981-07-01), Chiou

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