Earpiece with microphone

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

Patent

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Details

D14223, D14206, 1401

Patent

active

D04200071

REFERENCES:
patent: D309305 (1990-07-01), Von Hall
patent: D311521 (1990-10-01), Jonsson et al.
patent: D371133 (1996-06-01), Andrea
patent: 4893344 (1990-01-01), Tragardh et al.
patent: 5625171 (1997-04-01), Marshall

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