Sound-recording apparatus
United States Patent 1772990

Inventors:
Feher, Joseph D.
Publication Date:
08/12/1930
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Assignee:
Feher, Joseph D.
Primary Class:
369/191.100
Other Classes:
194/308, 312/71
International Classes:
G07F11/10; G07F17/30; G07F11/04; G07F17/00