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Automatic signal and barrier device for railroad crossings
US 2,874,493 A
Filed
: 08/31/1956
Issued
: 02/24/1959
Est. Priority Date
: 08/31/1956
Status: Expired due to Term
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Current Assignee
Henri Mandel
Original Assignee
Henri Mandel
Inventors
HENRI MANDEL
Application Number
US03/607,468
Time in Patent Office
907 Days
Field of Search
US Class Current
49/34
CPC Class Codes
B61L 29/023
Special gates
B61L 29/04
Gates for level crossings
E01F 13/06
by swinging into open posit...
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