FR723922A - Improvements to electromagnetic relays - Google Patents

Improvements to electromagnetic relays

Info

Publication number
FR723922A
FR723922A FR723922DA FR723922A FR 723922 A FR723922 A FR 723922A FR 723922D A FR723922D A FR 723922DA FR 723922 A FR723922 A FR 723922A
Authority
FR
France
Prior art keywords
electromagnetic relays
relays
electromagnetic
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.)
SPX Corp
Original Assignee
General Railway Signal Co
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 General Railway Signal Co filed Critical General Railway Signal Co
Application granted granted Critical
Publication of FR723922A publication Critical patent/FR723922A/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
    • B61L1/185—Use of direct current

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
FR723922D 1930-10-15 1931-10-07 Improvements to electromagnetic relays Expired FR723922A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US723922XA 1930-10-15 1930-10-15

Publications (1)

Publication Number Publication Date
FR723922A true FR723922A (en) 1932-04-18

Family

ID=22107257

Family Applications (1)

Application Number Title Priority Date Filing Date
FR723922D Expired FR723922A (en) 1930-10-15 1931-10-07 Improvements to electromagnetic relays

Country Status (1)

Country Link
FR (1) FR723922A (en)

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