Clapper megaphone

Details Clapper megaphone Clapper megaphone

1997-06-13

1998-12-29

Wallace, Terry A.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Public address system

D14208, 1403

Patent

active

D04033230

REFERENCES:
patent: D232239 (1974-07-01), Schafler
patent: D271968 (1983-12-01), Segan et al.
patent: D275852 (1984-10-01), Brisson
patent: 785874 (1905-03-01), Gould
patent: 5094317 (1992-03-01), Ladendofr

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