Combined microphone, amplifier and headset

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

Patent

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Details

D14 36, D14 96

Patent

active

D02800969

REFERENCES:
patent: D245776 (1977-09-01), Dellar
patent: D260255 (1981-08-01), Dietrich
patent: 4259547 (1981-03-01), Valley et al.
patent: 4472603 (1984-09-01), Berg
Woodward & Lothrop "America, Capture the Spirit" Catalog, p. 29.

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