BE455840A - - Google Patents

Info

Publication number
BE455840A
BE455840A BE455840A BE455840A BE455840A BE 455840 A BE455840 A BE 455840A BE 455840 A BE455840 A BE 455840A BE 455840 A BE455840 A BE 455840A BE 455840 A BE455840 A BE 455840A
Authority
BE
Belgium
Prior art keywords
roof
size
desc
page number
driving device
Prior art date
Application number
BE455840A
Other languages
English (en)
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.)
Filing date
Publication date
Application filed filed Critical
Publication of BE455840A publication Critical patent/BE455840A/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK 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
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
    • E21D23/0073—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices with advancing shifting devices connected therewith
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14—Telescopic props
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props

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)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Invalid Beds And Related Equipment (AREA)
BE455840A 1943-03-22 1944-05-17 BE455840A (instruction)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE956225X 1943-03-22

Publications (1)

Publication Number Publication Date
BE455840A true BE455840A (instruction) 1944-06-30

Family

ID=1558806

Family Applications (1)

Application Number Title Priority Date Filing Date
BE455840A BE455840A (instruction) 1943-03-22 1944-05-17

Country Status (2)

Country Link
BE (1) BE455840A (instruction)
FR (1) FR956225A (instruction)

Also Published As

Publication number Publication date
FR956225A (instruction) 1950-01-26

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