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Railway signal system
US 1,517,549 A
Filed
: 11/21/1919
Issued
: 12/02/1924
Est. Priority Date
: 11/21/1919
Status: Expired due to Term
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21 Citations
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Current Assignee
Lloyd Espenschied
Original Assignee
Lloyd Espenschied
Inventors
Espenschied, Lloyd
Application Number
US02/339,658
Time in Patent Office
1,838 Days
Field of Search
US Class Current
246/63.00R
CPC Class Codes
B61L 3/221
using track circuits
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