Microphone

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

Patent

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Patent

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D02908387

REFERENCES:
patent: D213567 (1969-03-01), Kahn
patent: D247705 (1978-04-01), Armstrong
patent: D247706 (1978-04-01), Armstrong
Fordham Radio-1982 catalog, p. 162, top left, Model DM-305.
Radio Shack 1984 catalog, p. 50, bottom left, item "D".
Arista Audio and Electronics Accessories-catalog 734, .COPYRGT.1973, p. 5, top left-Model 622.

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