Microphone for flat surfaces

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

Patent

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Details

D14227, 1401

Patent

active

D04284062

REFERENCES:
patent: D173367 (1954-11-01), McVay
patent: D245776 (1977-09-01), Dellar
patent: D278625 (1985-04-01), Mathiasen
patent: 3459902 (1969-08-01), Warning
patent: 4789044 (1988-12-01), Akino

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