PROXIMITY DETECTION SYSTEM USING FIELD EFFECT TRANSISTORS
United States Patent 3543056

Inventors:
Klein, Carl F.
Publication Date:
11/24/1970
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Assignee:
JOHNSON SERVICE CO
Primary Class:
327/517
Other Classes:
307/652, 340/565, 327/581
International Classes:
G08B13/26; G08B13/22
US Patent References:
2556458Static electricity indicator
Foreign References:
GB1009271A




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