Combined microphone and loudspeaker for a communication radio in

Recording – communication – or information retrieval equipment – Computer – data processor equipment

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D1401

Patent

active

D02517833

REFERENCES:
patent: D238684 (1976-02-01), Walz
patent: D245692 (1977-09-01), Imazeki
patent: D246780 (1977-12-01), Renken
patent: 3976840 (1976-08-01), Clevland et al.
Radio Shack Electronics Cat. No. 276, p. 130, C. B. Microphone, top left of page.

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