A railroad crossing signalling system

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088 ‡aDOT Case No. TSC-10009
088 ‡aSerial No. 184,828
100 1 ‡aHopkins, John B.
245 1 0 ‡aA railroad crossing signalling system.
260 ‡c1971.
300 ‡a16 p. : ‡bfigs.
538 ‡aMode of access: Internet.
590 ‡aAuthor corporate affiliation: Transportation Department, Washington, D.C.
590 ‡aApplication for letters patent
590 ‡aSubject code: CDJI
590 ‡aSubject code: CIGC
590 ‡aSubject code: HBED
590 ‡aSubject code: IEB
590 ‡aSubject code: XFM
650 7 ‡aTraffic signal control systems. ‡2trt
650 7 ‡aRemote control. ‡2trt
650 7 ‡aRailroad grade crossings. ‡2trt
650 7 ‡aMicrowave communication systems. ‡2trt
650 7 ‡aInfrastructure. ‡2trt
650 7 ‡aGrade crossing protection systems. ‡2trt
650 7 ‡aDriver information systems. ‡2trt
650 7 ‡aRemote-Control Signals. ‡2umitrist
650 7 ‡aRailway Crossings. ‡2umitrist
650 7 ‡aMicrowave Systems. ‡2umitrist
650 7 ‡aDriving Environment Information Systems. ‡2umitrist
650 7 ‡aCrossing Signals. ‡2umitrist
899 ‡a39015071699071 ‡bUMTRI
CID ‡a005459056
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DAT 1 ‡a20240131061316.0 ‡b2024-03-30T17:47:56Z
DAT 2 ‡a2024-03-30T17:30:02Z ‡b2020-10-29T20:00:02Z
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