Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Public address system
Patent
1987-03-16
1991-01-01
Feifer, Melvin B.
Recording, communication, or information retrieval equipment
Video or audio transmission, recording or playback equipment
Public address system
Patent
active
D03134164
REFERENCES:
patent: D210539 (1968-03-01), Wright
patent: D220882 (1971-06-01), Pastor
patent: D247966 (1978-05-01), Sieler
patent: 3268229 (1966-08-01), Funk
patent: 4227258 (1980-10-01), Root et al.
patent: 4676619 (1987-06-01), Woolley
Feifer Melvin B.
Jeo David
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