Title:
Apparatus for electric signaling systems
United States Patent 2129313
Inventors:
Whitelock, Leland D.
Publication Date:
09/06/1938
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Assignee:
UNION SWITCH & SIGNAL CO
Primary Class:
Other Classes:
330/123, 330/192, 330/185, 330/142
International Classes:
H03C1/54; H03C1/00