Speaker phone

Details Speaker phone Speaker phone

1992-06-23

1993-12-28

Douglas, Alan P.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Telephone equipment

Patent

active

D03427323

REFERENCES:
patent: D292283 (1987-10-01), Matsuda
patent: D300322 (1989-03-01), Iam
patent: D325734 (1992-04-01), Miyai
patent: D331060 (1992-11-01), Emmons et al.

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