Non-electronic sound amplifier

Details Non-electronic sound amplifier Non-electronic sound amplifier

1985-02-12

1987-11-24

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

181129

Patent

active

D02929163

REFERENCES:
patent: D244467 (1977-05-01), Aquilino
patent: D269611 (1983-07-01), Saito
patent: D278431 (1985-04-01), Beard
patent: D286873 (1986-11-01), Ikeda
patent: 2537201 (1951-01-01), Amfitheatrof
patent: 4574912 (1986-03-01), Fuss et al.

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