Head phone

Details Head phone Head phone

1976-02-23

1977-11-29

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02465191

REFERENCES:
patent: D229312 (1973-11-01), Itagaki
patent: D235210 (1975-05-01), Hill
patent: 3311713 (1967-03-01), Knuebel
patent: 3681540 (1972-08-01), Thomson

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