Public address unit

Details Public address unit Public address unit

1987-12-04

1991-02-26

Ansher, Bernard

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Public address system

D21111

Patent

active

D03149625

REFERENCES:
patent: D218897 (1970-10-01), Thompson
patent: D249571 (1978-09-01), David et al.
patent: D295224 (1988-04-01), Miyamoto
patent: 3007014 (1961-10-01), Bentman
patent: 3562446 (1971-02-01), Wolf
Ford Ham Catalog, 1987, p. 99, Microphones.
Radio Shack Catalog, 1983, p. 48, Realistic Microphones.
Fordham Radio Catalog, 1987, p. 100, Microphones.
Music Trades Magazine, Jun. 1987, p. 11, DOD Electronics ad.

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