Automatic electrical control device
United States Patent 2188973

Inventors:
Bonner, Raymond W.
Hall, Phil D.
Publication Date:
02/06/1940
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Assignee:
Raymond, Bonner W.
Harry, Kirschbaum M.
Primary Class:
307/652
Other Classes:
340/562, 331/65, 331/74, 116/6, 361/181
International Classes:
G08B13/26; G08B13/22