Electrical control apparatus
United States Patent 2250214
Inventors:
Ashworth, Harry E.
Publication Date:
07/22/1941
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Assignee:
UNION SWITCH & SIGNAL CO
Primary Class:
Other Classes:
361/208, 340/664, 246/219, 340/825.770, 246/3
International Classes:
B61L5/18; B61L5/00