Telephone handset amplifier

Details Telephone handset amplifier Telephone handset amplifier

1979-04-30

1982-09-07

Tung, T.

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02660857

REFERENCES:
patent: D190585 (1961-06-01), Diller
patent: D211251 (1968-06-01), Ota
patent: D225750 (1973-01-01), Marsalka et al.
patent: 2214992 (1940-09-01), Chevasslis
patent: 3254160 (1966-05-01), Day et al.
patent: 3277243 (1966-10-01), Fairbairn
patent: 4151376 (1979-04-01), Walker
patent: 4160122 (1979-07-01), Jacobson
patent: 4191861 (1980-03-01), Walker

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