FR663918A - Signal system in combination with lighting for underground operating works - Google Patents

Signal system in combination with lighting for underground operating works

Info

Publication number
FR663918A
FR663918A FR663918DA FR663918A FR 663918 A FR663918 A FR 663918A FR 663918D A FR663918D A FR 663918DA FR 663918 A FR663918 A FR 663918A
Authority
FR
France
Prior art keywords
lighting
combination
signal system
underground operating
operating works
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.)
Siemens Schuckertwerke AG
Siemens AG
Original Assignee
Siemens Schuckertwerke AG
Siemens AG
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 Siemens Schuckertwerke AG, Siemens AG filed Critical Siemens Schuckertwerke AG
Application granted granted Critical
Publication of FR663918A publication Critical patent/FR663918A/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)
FR663918D 1927-11-23 1928-11-14 Signal system in combination with lighting for underground operating works Expired FR663918A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE663918X 1927-11-23

Publications (1)

Publication Number Publication Date
FR663918A true FR663918A (en) 1929-08-27

Family

ID=6589338

Family Applications (1)

Application Number Title Priority Date Filing Date
FR663918D Expired FR663918A (en) 1927-11-23 1928-11-14 Signal system in combination with lighting for underground operating works

Country Status (2)

Country Link
FR (1) FR663918A (en)
NL (1) NL28246C (en)

Also Published As

Publication number Publication date
NL28246C (en)

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