Megaphone

Details Megaphone Megaphone

1999-04-26

2000-05-30

Bondade, Nanda

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Public address system

1403

Patent

active

D04258940

REFERENCES:
patent: D116793 (1939-09-01), Carbonaro
patent: D215974 (1969-11-01), Berns
patent: D312591 (1990-12-01), Memmola
patent: D329615 (1992-09-01), Stiner
patent: D361536 (1995-08-01), Pagani et al.
patent: 1683879 (1928-09-01), Ewald
patent: 2172413 (1939-09-01), Scott

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