GB759852A - Improvements in or relating to electrically operated signalling systems - Google Patents

Improvements in or relating to electrically operated signalling systems

Info

Publication number
GB759852A
GB759852A GB710853A GB710853A GB759852A GB 759852 A GB759852 A GB 759852A GB 710853 A GB710853 A GB 710853A GB 710853 A GB710853 A GB 710853A GB 759852 A GB759852 A GB 759852A
Authority
GB
United Kingdom
Prior art keywords
circuit
coil
wires
contacts
rectifier
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
GB710853A
Other languages
English (en)
Inventor
George Denholm
Leonard Archer Nordmann
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.)
HUGH WOOD AND Co Ltd
Original Assignee
HUGH WOOD AND Co Ltd
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
Priority to BE523142D priority Critical patent/BE523142A/xx
Application filed by HUGH WOOD AND Co Ltd filed Critical HUGH WOOD AND Co Ltd
Priority to GB710853A priority patent/GB759852A/en
Priority to FR1085295D priority patent/FR1085295A/fr
Publication of GB759852A publication Critical patent/GB759852A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/18—Special adaptations of signalling or alarm devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Emergency Alarm Devices (AREA)
GB710853A 1953-03-14 1953-03-14 Improvements in or relating to electrically operated signalling systems Expired GB759852A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE523142D BE523142A (en:Method) 1953-03-14
GB710853A GB759852A (en) 1953-03-14 1953-03-14 Improvements in or relating to electrically operated signalling systems
FR1085295D FR1085295A (fr) 1953-03-14 1953-10-20 Perfectionnements aux dispositifs électriques de signalisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB710853A GB759852A (en) 1953-03-14 1953-03-14 Improvements in or relating to electrically operated signalling systems

Publications (1)

Publication Number Publication Date
GB759852A true GB759852A (en) 1956-10-24

Family

ID=9826756

Family Applications (1)

Application Number Title Priority Date Filing Date
GB710853A Expired GB759852A (en) 1953-03-14 1953-03-14 Improvements in or relating to electrically operated signalling systems

Country Status (3)

Country Link
BE (1) BE523142A (en:Method)
FR (1) FR1085295A (en:Method)
GB (1) GB759852A (en:Method)

Also Published As

Publication number Publication date
FR1085295A (fr) 1955-01-31
BE523142A (en:Method)

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