Acoustic telephone

Details Acoustic telephone Acoustic telephone

1996-03-08

1997-08-12

Asch, Jeffrey

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

D21111, 1403

Patent

active

D03822737

REFERENCES:
patent: D85679 (1931-12-01), Weeber et al.
patent: D276609 (1984-12-01), Schwartz
patent: D279673 (1985-07-01), Rivette et al.

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