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Coded track circuit singaling system
US 2,635,181 A
Filed
: 02/13/1946
Issued
: 04/14/1953
Est. Priority Date
: 02/13/1946
Status: Expired due to Term
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Current Assignee
Hughson J. Donald
Original Assignee
Hughson J. Donald
Inventors
Donald, Hughson J.
Application Number
US02/647,270
Time in Patent Office
2,617 Days
Field of Search
US Class Current
246/41
CPC Class Codes
B61L 23/168
using coded current
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