Title:
Piezo-electrical voltage indicator
United States Patent 1438974

Inventors:
Wente, Edward C.
Publication Date:
12/19/1922
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Assignee:
WESTERN ELECTRIC CO
Primary Class:
324/97
Other Classes:
324/109, 310/331, 367/162, 359/215, 310/326, 367/151, 359/224, 359/872
International Classes:
G01R13/40; G01R13/00