Headphone

Details Headphone Headphone

1976-06-11

1977-05-10

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02443007

REFERENCES:
patent: D218103 (1970-07-01), Kliewer
patent: D222547 (1971-11-01), Kantor
patent: 3447160 (1969-06-01), Teder
patent: 3454964 (1969-07-01), Brinkhoff
patent: 3681540 (1972-08-01), Thomson

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