Headphone

Details Headphone Headphone

1977-03-04

1978-03-07

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02474336

REFERENCES:
patent: D228352 (1973-09-01), Itagaki
patent: D244300 (1977-05-01), Besasie
patent: 3488457 (1970-01-01), Lahti
patent: 3810525 (1974-05-01), Crenna
patent: 3891810 (1975-06-01), Hayashi

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