Headphone combined with microphone

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

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D14205

Patent

active

D03765989

REFERENCES:
patent: D254183 (1980-02-01), Doodson
patent: D353818 (1994-12-01), Nakamura
patent: 3087028 (1963-04-01), Bonnin
Hong Kong Enterprise Jun. 1991, p. 130, Headphone model No. SW 1100.

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