FR847951A - Collapsing device - Google Patents

Collapsing device

Info

Publication number
FR847951A
FR847951A FR847951DA FR847951A FR 847951 A FR847951 A FR 847951A FR 847951D A FR847951D A FR 847951DA FR 847951 A FR847951 A FR 847951A
Authority
FR
France
Prior art keywords
collapsing device
collapsing
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
Lestavel Pierre Henri Joseph
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
Application granted granted Critical
Publication of FR847951A publication Critical patent/FR847951A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/60—Devices for withdrawing props or chocks

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
FR847951D 1938-12-23 1938-12-23 Collapsing device Expired FR847951A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR847951T 1938-12-23

Publications (1)

Publication Number Publication Date
FR847951A true FR847951A (en) 1939-10-19

Family

ID=9314021

Family Applications (1)

Application Number Title Priority Date Filing Date
FR847951D Expired FR847951A (en) 1938-12-23 1938-12-23 Collapsing device

Country Status (1)

Country Link
FR (1) FR847951A (en)

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