Touch dial key pad speaker telephone for a "clean room" or the l

Details Touch dial key pad speaker telephone for a "clean room" or the l Touch dial key pad speaker telephone for a "clean room" or the l

1990-09-20

1992-11-17

Fay, Jr., Horace B.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

D14142, D14140, D14240

Patent

active

D03310639

REFERENCES:
patent: D238186 (1975-12-01), Kramer et al.
patent: D260889 (1981-09-01), McLean
patent: D270053 (1983-08-01), Bosch
patent: D272346 (1984-01-01), Kaczkos
patent: D316549 (1991-04-01), Hompf
patent: 4439647 (1984-03-01), Calandrella et al.
patent: 4680790 (1987-07-01), Packard et al.
patent: 4817164 (1989-03-01), Bertignolli
patent: 4866764 (1989-09-01), Barker
Design News Reprint, Aug. 8, 1977; .COPYRGT.1977; Brady front switch panel; p. 3 and reverse side text & picture.
"NEI DAC" Auteldac 600 Series Telephone, Dec. 15, 1990.

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