NL284968A - - Google Patents

Info

Publication number
NL284968A
NL284968A NL284968DA NL284968A NL 284968 A NL284968 A NL 284968A NL 284968D A NL284968D A NL 284968DA NL 284968 A NL284968 A NL 284968A
Authority
NL
Netherlands
Application number
Publication of NL284968A publication Critical patent/NL284968A/xx

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D17/082—Cap joints for obtaining a coal-face free of pit-props of sliding type
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/0052—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor with advancing shifting devices connected therewith

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)
NL284968D NL284968A (zh)

Publications (1)

Publication Number Publication Date
NL284968A true NL284968A (zh)

Family

ID=1872460

Family Applications (1)

Application Number Title Priority Date Filing Date
NL284968D NL284968A (zh)

Country Status (1)

Country Link
NL (1) NL284968A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5743679A (en) * 1995-08-02 1998-04-28 Dbt Deutsche Bergbau-Technik Gmbh Hydraulic shield support frame

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5743679A (en) * 1995-08-02 1998-04-28 Dbt Deutsche Bergbau-Technik Gmbh Hydraulic shield support frame

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