Electric signaling system
United States Patent 1975371

Inventors:
Place, Willard P.
Publication Date:
10/02/1934
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Assignee:
UNION SWITCH & SIGNAL CO
Primary Class:
330/189
Other Classes:
331/75, 327/583, 332/182, 333/28R, 246/63C
International Classes:
B61L15/00