ANTENNA SYSTEM FOR PROXIMITY CONTROL
United States Patent 3551919
Inventors:
Forbes, Norman Arthur
Publication Date:
01/05/1971
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Assignee:
AMERICAN STANDARD INC
Primary Class:
Other Classes:
4/313, 307/116, 340/562, 4/305, 361/280, 251/129.040
International Classes:
E03C1/05; H03K17/955; H03K17/94; A47K1/04