FR377654A - Signal device for mines - Google Patents

Signal device for mines

Info

Publication number
FR377654A
FR377654A FR377654DA FR377654A FR 377654 A FR377654 A FR 377654A FR 377654D A FR377654D A FR 377654DA FR 377654 A FR377654 A FR 377654A
Authority
FR
France
Prior art keywords
mines
signal device
signal
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)
Inventor
Heinrich Huelsermann
Caspar Dehnen
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.)
CASPAR DEHNEN
HEINRICH HUELSERMANN
Original Assignee
CASPAR DEHNEN
HEINRICH HUELSERMANN
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 CASPAR DEHNEN, HEINRICH HUELSERMANN filed Critical CASPAR DEHNEN
Application granted granted Critical
Publication of FR377654A publication Critical patent/FR377654A/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)
FR377654D 1907-04-17 1907-04-17 Signal device for mines Expired FR377654A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR377654T 1907-04-17

Publications (1)

Publication Number Publication Date
FR377654A true FR377654A (en) 1907-09-12

Family

ID=1424068

Family Applications (1)

Application Number Title Priority Date Filing Date
FR377654D Expired FR377654A (en) 1907-04-17 1907-04-17 Signal device for mines

Country Status (1)

Country Link
FR (1) FR377654A (en)

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