Headphone

Details Headphone Headphone

1986-03-24

1988-12-20

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

Patent

active

D02990253

REFERENCES:
patent: D244300 (1977-05-01), Besasie
patent: D254910 (1980-05-01), Lung
patent: D286632 (1986-11-01), Teunis
patent: 4173715 (1979-11-01), Gosman
patent: 4551584 (1985-11-01), Mathiasen

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