FR1342788A - Remote danger sign - Google Patents

Remote danger sign

Info

Publication number
FR1342788A
FR1342788A FR904972A FR904972A FR1342788A FR 1342788 A FR1342788 A FR 1342788A FR 904972 A FR904972 A FR 904972A FR 904972 A FR904972 A FR 904972A FR 1342788 A FR1342788 A FR 1342788A
Authority
FR
France
Prior art keywords
danger sign
remote danger
remote
sign
danger
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
FR904972A
Other languages
French (fr)
Inventor
Domenico Lopez
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 filed Critical
Priority to FR904972A priority Critical patent/FR1342788A/en
Application granted granted Critical
Publication of FR1342788A publication Critical patent/FR1342788A/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
    • E21F17/185—Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence

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)
FR904972A 1962-07-17 1962-07-17 Remote danger sign Expired FR1342788A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR904972A FR1342788A (en) 1962-07-17 1962-07-17 Remote danger sign

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR904972A FR1342788A (en) 1962-07-17 1962-07-17 Remote danger sign

Publications (1)

Publication Number Publication Date
FR1342788A true FR1342788A (en) 1963-11-15

Family

ID=8783854

Family Applications (1)

Application Number Title Priority Date Filing Date
FR904972A Expired FR1342788A (en) 1962-07-17 1962-07-17 Remote danger sign

Country Status (1)

Country Link
FR (1) FR1342788A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2330090A1 (en) * 1975-10-31 1977-05-27 Cargnel Gianangelo Landslide warning network which detects slight earth movements - uses microswitches and fracturing wires with connections to relay to trigger alarm
FR2521623A1 (en) * 1982-02-17 1983-08-19 Arnal Louis Deflection detector for fresh concrete - has alarm stopping shutter striking at max. permissible concrete deflection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2330090A1 (en) * 1975-10-31 1977-05-27 Cargnel Gianangelo Landslide warning network which detects slight earth movements - uses microswitches and fracturing wires with connections to relay to trigger alarm
FR2521623A1 (en) * 1982-02-17 1983-08-19 Arnal Louis Deflection detector for fresh concrete - has alarm stopping shutter striking at max. permissible concrete deflection

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