MINIATURE CERAMIC MICROPHONE
United States Patent 3439128
US Patent References:
Piezo-electric-crystal mounting
- - 1649081

Sound signaling apparatus
- - 2411146


Inventors:
Sobel, Ilyitch J.
Didyk, Witalij
Publication Date:
04/15/1969
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Assignee:
ZENITH RADIO CORP
Primary Class:
381/355
Other Classes:
381/173, 310/324, 381/361, 310/358, 310/326
International Classes:
H04R17/02; H04R25/00; H04R17/02




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