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 (zh)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
BE516921A true BE516921A (zh)

Family

ID=6686367

Family Applications (1)

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

Country Status (3)

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

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

Similar Documents

Publication Publication Date Title
FR999141A (zh)
FR999279A (zh)
BE519351A (zh)
BE519402A (zh)
LU31297A1 (zh)
BE536168A (zh)
BE525034A (zh)
BE522483A (zh)
BE522399A (zh)
BE520189A (zh)
BE519509A (zh)
BE518090A (zh)
BE518075A (zh)
BE521251A (zh)
BE520933A (zh)
BE520886A (zh)
BE520711A (zh)
BE520639A (zh)
BE520495A (zh)
BE520268A (zh)
BE520063A (zh)
BE520056A (zh)
BE519943A (zh)
BE511825A (zh)
BE513249A (zh)