FR491497A - Improvements to railway signals - Google Patents

Improvements to railway signals

Info

Publication number
FR491497A
FR491497A FR491497DA FR491497A FR 491497 A FR491497 A FR 491497A FR 491497D A FR491497D A FR 491497DA FR 491497 A FR491497 A FR 491497A
Authority
FR
France
Prior art keywords
railway signals
railway
signals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mckenzie Holland & Westinghouse Power Signal Compa
Original Assignee
Mckenzie Holland & Westinghouse Power Signal Compa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mckenzie Holland & Westinghouse Power Signal Compa filed Critical Mckenzie Holland & Westinghouse Power Signal Compa
Application granted granted Critical
Publication of FR491497A publication Critical patent/FR491497A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/18—Railway track circuits
    • B61L1/181—Details
    • B61L1/187—Use of alternating current

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
FR491497D 1917-12-15 1918-08-28 Improvements to railway signals Expired FR491497A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US491497XA 1917-12-15 1917-12-15

Publications (1)

Publication Number Publication Date
FR491497A true FR491497A (en) 1919-06-04

Family

ID=1527496

Family Applications (1)

Application Number Title Priority Date Filing Date
FR491497D Expired FR491497A (en) 1917-12-15 1918-08-28 Improvements to railway signals

Country Status (1)

Country Link
FR (1) FR491497A (en)

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