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FR954023A - Balls for support in mines - Google Patents

Balls for support in mines

Info

Publication number
FR954023A
FR954023A FR954023DA FR954023A FR 954023 A FR954023 A FR 954023A FR 954023D A FR954023D A FR 954023DA FR 954023 A FR954023 A FR 954023A
Authority
FR
France
Prior art keywords
mines
balls
support
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.)
ARTESIENNE DE CONST MECANIQUES
Original Assignee
ARTESIENNE DE CONST MECANIQUES
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 ARTESIENNE DE CONST MECANIQUES filed Critical ARTESIENNE DE CONST MECANIQUES
Application granted granted Critical
Publication of FR954023A publication Critical patent/FR954023A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/02—Cantilever extension or similar protecting devices
    • E21D17/08—Cap joints for obtaining a coal-face free of pit-props
    • E21D17/086—Cap joints for obtaining a coal-face free of pit-props or articulated type

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)
FR954023D 1947-09-20 1947-09-20 Balls for support in mines Expired FR954023A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR954023T 1947-09-20

Publications (1)

Publication Number Publication Date
FR954023A true FR954023A (en) 1949-12-16

Family

ID=9487395

Family Applications (1)

Application Number Title Priority Date Filing Date
FR954023D Expired FR954023A (en) 1947-09-20 1947-09-20 Balls for support in mines

Country Status (1)

Country Link
FR (1) FR954023A (en)

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