Headphone radio

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Radio receiver – tuner or amplifier – or housing therefor

Patent

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Details

D14205, 1403

Patent

active

D04185099

REFERENCES:
patent: D340033 (1993-10-01), Okumura et al.
patent: D342947 (1994-01-01), Totsuka
patent: D342949 (1994-01-01), Hyogo
patent: D352036 (1994-11-01), Sekita
Audio-The Equipment Authority, p. 69, Headphone model No. HD 520 II, Sep. 1994.

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