Chairman unit for conference system

Details Chairman unit for conference system Chairman unit for conference system

1992-11-13

1994-08-02

Bullock, B. J.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Intercom

D14226

Patent

active

D03492850

REFERENCES:
patent: D218897 (1970-10-01), Thompson
patent: D238684 (1976-02-01), Walz
patent: D243536 (1977-03-01), van de Poel
patent: D269780 (1983-07-01), Doodson
patent: D331054 (1992-11-01), Brahler
patent: 4075426 (1978-02-01), Gould
patent: 4641240 (1987-02-01), Boram

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