Non-electronic sound amplifier headset or the like

Details Non-electronic sound amplifier headset or the like Non-electronic sound amplifier headset or the like

1984-08-23

1986-11-25

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

Patent

active

D02868733

REFERENCES:
patent: D244467 (1977-05-01), Aquilino
patent: D269611 (1983-07-01), Saito
patent: D278431 (1985-04-01), Beard
patent: 2537201 (1951-01-01), Amfitheatrof
patent: 3308480 (1967-03-01), Elder

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