Head phone

Details Head phone Head phone

1993-12-30

1995-01-31

Wallace, Terry A.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Speaker or housing therefor

D14223

Patent

active

D03549585

REFERENCES:
patent: D262019 (1981-11-01), Upshaw
patent: D288807 (1987-03-01), Hlavaty
patent: D291198 (1987-08-01), Bellini
Popular Mechanics dated Nov. 80, p. 96, Serial ATH-1 (bottom left side).
Crutchfield Catalog, dated Summer 1986, p. 89 serial #HD-410 SL (top right side corner) & K-240 (left side as marked).

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