Headphone

Details Headphone Headphone

1987-10-16

1990-01-16

Feifer, Melvin B.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Speaker or housing therefor

Patent

active

D03055418

REFERENCES:
patent: D286772 (1986-11-01), Pope
patent: D299454 (1989-01-01), Kwong
patent: D300133 (1989-03-01), Daidoh et al.
patent: 4634816 (1987-01-01), O'Malley et al.
patent: 4689822 (1987-08-01), Houng

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