Title:
Coded signaling apparatus
Document Type and Number:
United States Patent 2559391

Inventors:
Blosser, Herman G.
Nicholson, Frank H.
Publication Date:
07/03/1951
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Assignee:
UNION SWITCH & SIGNAL CO
Primary Class:
246/34R
Other Classes:
340/825.590
International Classes:
B61L23/16; B61L23/00
US Patent References:
2021654Railway traffic controlling apparatus
2164668Railway traffic controlling apparatus
2221726Railway track circuit apparatus


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