Headphone

Details Headphone Headphone

1978-02-06

1980-06-10

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02553520

REFERENCES:
patent: D235149 (1975-05-01), Dascal
patent: D246259 (1977-11-01), Nishimura et al.
patent: D246519 (1977-11-01), Kato
patent: 3488457 (1970-01-01), Lahti
patent: 4037064 (1977-07-01), Yasuda

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