FR958217A - - Google Patents

Info

Publication number
FR958217A
FR958217A FR958217DA FR958217A FR 958217 A FR958217 A FR 958217A FR 958217D A FR958217D A FR 958217DA FR 958217 A FR958217 A FR 958217A
Authority
FR
France
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)
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.)
Publication date
Application granted granted Critical
Publication of FR958217A publication Critical patent/FR958217A/fr
Expired legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00Caps for supporting mine roofs
    • E21D17/02Cantilever extension or similar protecting devices
    • E21D17/08Cap joints for obtaining a coal-face free of pit-props
    • E21D17/086Cap 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)
  • Bridges Or Land Bridges (AREA)
FR958217D 1947-11-17 Expired FR958217A (US07534539-20090519-C00280.png)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR661674X 1947-11-17

Publications (1)

Publication Number Publication Date
FR958217A true FR958217A (US07534539-20090519-C00280.png) 1950-03-06

Family

ID=9011035

Family Applications (1)

Application Number Title Priority Date Filing Date
FR958217D Expired FR958217A (US07534539-20090519-C00280.png) 1947-11-17

Country Status (2)

Country Link
FR (1) FR958217A (US07534539-20090519-C00280.png)
GB (1) GB661674A (US07534539-20090519-C00280.png)

Also Published As

Publication number Publication date
GB661674A (en) 1951-11-28

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