Combined microphone, speaker and amplifier

Details Combined microphone, speaker and amplifier Combined microphone, speaker and amplifier

1990-07-31

1993-01-19

Feifer, Melvin B.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

D14186, D14187

Patent

active

D03326080

REFERENCES:
patent: D182820 (1958-05-01), Kamp
patent: D185860 (1959-08-01), Armstrong et al.
patent: D296781 (1988-07-01), Kohno
patent: D321692 (1991-11-01), Siddoway et al.
patent: 3626617 (1971-12-01), Frey
patent: 4527019 (1985-07-01), Lemp

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