Universal acoustic telephone handset interface

Details Universal acoustic telephone handset interface Universal acoustic telephone handset interface

1992-02-13

1993-10-26

Douglas, Alan P.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03407225

REFERENCES:
patent: D208787 (1967-10-01), Bennstrom-Prescott
patent: D265992 (1982-08-01), Hirata et al.
patent: D270834 (1983-10-01), Genaro et al.
patent: D272345 (1984-01-01), Kessler
patent: D333139 (1993-02-01), Poupore
patent: 3553374 (1971-01-01), Wolf

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