Humorous megaphone

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Public address system

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1403

Patent

active

D04315499

REFERENCES:
patent: D55295 (1920-05-01), Marsico
patent: D232239 (1974-07-01), Schafler
patent: D303530 (1989-09-01), Baer
patent: D338464 (1993-08-01), Darby
patent: 5094317 (1992-03-01), Ladendorf
patent: 5675133 (1997-10-01), Kobayashi

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