BE516921A - - Google Patents

Info

Publication number
BE516921A
BE516921A BE516921DA BE516921A BE 516921 A BE516921 A BE 516921A BE 516921D A BE516921D A BE 516921DA BE 516921 A BE516921 A BE 516921A
Authority
BE
Belgium
Application number
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 of BE516921A publication Critical patent/BE516921A/xx

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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
BE516921D 1952-01-16 BE516921A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE775754X 1952-01-16

Publications (1)

Publication Number Publication Date
BE516921A true BE516921A (de)

Family

ID=6686367

Family Applications (1)

Application Number Title Priority Date Filing Date
BE516921D BE516921A (de) 1952-01-16

Country Status (3)

Country Link
BE (1) BE516921A (de)
FR (1) FR1069856A (de)
GB (1) GB775754A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959924A (en) * 1954-01-29 1960-11-15 Groetschel Karl Maria Connection for lagging irons

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3163011A (en) * 1960-11-14 1964-12-29 Karl M Groetschel Connection for lagging irons

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959924A (en) * 1954-01-29 1960-11-15 Groetschel Karl Maria Connection for lagging irons

Also Published As

Publication number Publication date
GB775754A (en) 1957-05-29
FR1069856A (fr) 1954-07-13

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