Earphone with microphone

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment

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Patent

active

D03579212

REFERENCES:
patent: D315350 (1991-03-01), Ikeda
patent: D331062 (1992-11-01), Kanno
patent: D337119 (1993-07-01), Taniguchi
patent: D337589 (1993-07-01), Wada

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