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FR1251420A - Electronic indicating device for use in mines - Google Patents

Electronic indicating device for use in mines

Info

Publication number
FR1251420A
FR1251420A FR812681A FR812681A FR1251420A FR 1251420 A FR1251420 A FR 1251420A FR 812681 A FR812681 A FR 812681A FR 812681 A FR812681 A FR 812681A FR 1251420 A FR1251420 A FR 1251420A
Authority
FR
France
Prior art keywords
mines
indicating device
electronic indicating
electronic
indicating
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
FR812681A
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.)
Sargrove Electronics Ltd
Original Assignee
Sargrove Electronics 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
Application filed by Sargrove Electronics Ltd filed Critical Sargrove Electronics Ltd
Priority to FR812681A priority Critical patent/FR1251420A/en
Application granted granted Critical
Publication of FR1251420A publication Critical patent/FR1251420A/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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems

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)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR812681A 1959-12-10 1959-12-10 Electronic indicating device for use in mines Expired FR1251420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR812681A FR1251420A (en) 1959-12-10 1959-12-10 Electronic indicating device for use in mines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR812681A FR1251420A (en) 1959-12-10 1959-12-10 Electronic indicating device for use in mines

Publications (1)

Publication Number Publication Date
FR1251420A true FR1251420A (en) 1961-01-20

Family

ID=8722418

Family Applications (1)

Application Number Title Priority Date Filing Date
FR812681A Expired FR1251420A (en) 1959-12-10 1959-12-10 Electronic indicating device for use in mines

Country Status (1)

Country Link
FR (1) FR1251420A (en)

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