Head-phone

Details Head-phone Head-phone

1977-07-07

1980-02-12

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02541831

REFERENCES:
patent: D223256 (1972-04-01), Thomson
patent: D244300 (1977-05-01), Besasie
patent: D246519 (1977-11-01), Kato
patent: 3488457 (1970-01-01), Lahti
patent: 3579640 (1971-05-01), Beguin et al.
patent: 3952158 (1976-04-01), Kyle et al.

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