Sound power telephone

Details Sound power telephone Sound power telephone

1981-09-11

1984-09-04

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

Patent

active

D02753936

REFERENCES:
patent: D23949 (1895-01-01), Davis
patent: D53540 (1919-07-01), Timmons
patent: D102955 (1937-01-01), Obergfell
patent: D264967 (1982-06-01), Ender et al.
patent: 2502854 (1950-04-01), Cleaveland et al.

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