BE478763A - - Google Patents

Info

Publication number
BE478763A
BE478763A BE478763A BE478763A BE478763A BE 478763 A BE478763 A BE 478763A BE 478763 A BE478763 A BE 478763A BE 478763 A BE478763 A BE 478763A BE 478763 A BE478763 A BE 478763A
Authority
BE
Belgium
Prior art keywords
wedge
strut
prop
metal mine
retractable metal
Prior art date
Application number
BE478763A
Other languages
English (en)
Dutch (nl)
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 BE478763A publication Critical patent/BE478763A/nl

Links

Classifications

    • 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
    • E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
    • E21D15/285—Telescopic props with parts held relatively to each other by friction or gripping by means of wedges or wedge combinations

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
BE478763A 1946-11-07 1947-12-27 BE478763A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL128634A NL69243C (de) 1946-11-07 1946-11-07

Publications (1)

Publication Number Publication Date
BE478763A true BE478763A (de) 1948-01-31

Family

ID=1821563

Family Applications (1)

Application Number Title Priority Date Filing Date
BE478763A BE478763A (de) 1946-11-07 1947-12-27

Country Status (3)

Country Link
BE (1) BE478763A (de)
FR (1) FR958808A (de)
NL (1) NL69243C (de)

Also Published As

Publication number Publication date
FR958808A (de) 1950-03-21
NL69243C (de) 1951-12-16

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