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FR77450E - Electronic indicating device for use in mines - Google Patents

Electronic indicating device for use in mines

Info

Publication number
FR77450E
FR77450E FR823571A FR823571A FR77450E FR 77450 E FR77450 E FR 77450E FR 823571 A FR823571 A FR 823571A FR 823571 A FR823571 A FR 823571A FR 77450 E FR77450 E FR 77450E
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
FR823571A
Other languages
French (fr)
Inventor
Frederick Charles Riches
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
Application granted granted Critical
Publication of FR77450E publication Critical patent/FR77450E/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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
    • G08C15/02—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path simultaneously, i.e. using frequency division

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Measurement Of Current Or Voltage (AREA)
FR823571A 1956-10-17 1960-04-06 Electronic indicating device for use in mines Expired FR77450E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3157956A GB846895A (en) 1956-10-17 1956-10-17 An electronic indicator system more particularly for use in mines

Publications (1)

Publication Number Publication Date
FR77450E true FR77450E (en) 1962-03-02

Family

ID=10325236

Family Applications (1)

Application Number Title Priority Date Filing Date
FR823571A Expired FR77450E (en) 1956-10-17 1960-04-06 Electronic indicating device for use in mines

Country Status (2)

Country Link
FR (1) FR77450E (en)
GB (1) GB846895A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3128942A1 (en) * 1981-07-22 1983-05-05 Bergwerksverband Gmbh, 4300 Essen MULTIPLE-POINT MEASURING AND CONTROL SYSTEM

Also Published As

Publication number Publication date
GB846895A (en) 1960-08-31

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