FR894830A - Extension for iron mine poles - Google Patents

Extension for iron mine poles

Info

Publication number
FR894830A
FR894830A FR894830DA FR894830A FR 894830 A FR894830 A FR 894830A FR 894830D A FR894830D A FR 894830DA FR 894830 A FR894830 A FR 894830A
Authority
FR
France
Prior art keywords
poles
extension
iron mine
mine
iron
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
Other languages
French (fr)
Inventor
Alfred Strater
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
Application granted granted Critical
Publication of FR894830A publication Critical patent/FR894830A/en
Expired legal-status Critical Current

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
    • E21D15/50—Component parts or details of props
    • E21D15/52—Extensible units located above or below standard props
    • E21D15/526—Extensible units located above or below standard props for step-by-step extension of the prop

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)
FR894830D 1942-05-20 1943-05-20 Extension for iron mine poles Expired FR894830A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE894830X 1942-05-20

Publications (1)

Publication Number Publication Date
FR894830A true FR894830A (en) 1945-01-08

Family

ID=6847389

Family Applications (1)

Application Number Title Priority Date Filing Date
FR894830D Expired FR894830A (en) 1942-05-20 1943-05-20 Extension for iron mine poles

Country Status (1)

Country Link
FR (1) FR894830A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122475B (en) * 1955-06-07 1962-01-25 August Fischer Dipl Ing Length-adjustable pit support, in particular pit ram

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122475B (en) * 1955-06-07 1962-01-25 August Fischer Dipl Ing Length-adjustable pit support, in particular pit ram

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