Headphone

Details Headphone Headphone

1993-12-08

1994-12-27

Bullock, B. J.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Speaker or housing therefor

Patent

active

D03538184

REFERENCES:
patent: D229833 (1974-01-01), Becker
patent: 3810525 (1974-05-01), Crenna
Stereo Review; Dec. 1987; Headphone (top of page).
Crutchfield; Summer 1986; p. 89; Headphone I.

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