Headphone

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Speaker or housing therefor

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D03231674

REFERENCES:
patent: D270634 (1983-09-01), Ungar
patent: D300133 (1989-03-01), Daidoh et al.
patent: D305541 (1990-01-01), Hirose
patent: D310081 (1990-08-01), Daido et al.
patent: D310223 (1990-08-01), Chudnow
1987 Best Products Fall catalog, p. 236, bottom right--Item 11--Sony Headphones Model MDR-11.

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