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cr bn ---auaua |
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070314s1971 xxu 000 0 eng d |
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‡a(MiU)990054590560106381
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‡asdr-miu.990054590560106381
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‡aDOT Case No. TSC-10009
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‡aSerial No. 184,828
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100 |
1 |
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‡aHopkins, John B.
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245 |
1 |
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‡aA railroad crossing signalling system.
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260 |
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‡c1971.
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300 |
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‡a16 p. :
‡bfigs.
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538 |
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‡aMode of access: Internet.
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‡aAuthor corporate affiliation: Transportation Department, Washington, D.C.
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‡aApplication for letters patent
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‡aSubject code: CDJI
|
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‡aSubject code: CIGC
|
590 |
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‡aSubject code: HBED
|
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‡aSubject code: IEB
|
590 |
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‡aSubject code: XFM
|
650 |
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7 |
‡aTraffic signal control systems.
‡2trt
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650 |
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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
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‡b2024-03-30T17:47:56Z
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‡a2024-03-30T17:30:02Z
‡b2020-10-29T20:00:02Z
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‡tUS bib date1 >= 1929
|