Microphone input device

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

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D03574814

REFERENCES:
patent: D179540 (1957-01-01), Knechtsberger
patent: D222269 (1971-10-01), Gibson
patent: D296100 (1988-06-01), Kubota
patent: D313802 (1991-01-01), Peiker
Burstein-Applebee Catalog 641, dated 1963, p. 50 Serial #245 and 575.

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