Headphone

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

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D03366464

REFERENCES:
patent: D228352 (1973-09-01), Itagaki
patent: D229833 (1974-01-01), Becker
patent: D235210 (1975-05-01), Hill
patent: D244037 (1977-04-01), Warner et al.
patent: D254183 (1980-02-01), Doodson
patent: D255352 (1980-06-01), Besasie
patent: D262019 (1981-11-01), Upshaw
patent: D317767 (1991-06-01), Banks
patent: 4829571 (1989-05-01), Kakiuchi et al.
patent: 5018599 (1991-05-01), Dohi et al.
Popular Mechanics, Nov. 1980 p. 96, model AKG K-340, right side.
Telephony, Aug. 2, 1982 p. 15, headset, bottom.
Dak Industries, p. 9 headset, top.
Radio Shack 1988 Cat. Realistic Nova-40 headphones.

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