FR1009843A - Pit prop - Google Patents

Pit prop

Info

Publication number
FR1009843A
FR1009843A FR1009843DA FR1009843A FR 1009843 A FR1009843 A FR 1009843A FR 1009843D A FR1009843D A FR 1009843DA FR 1009843 A FR1009843 A FR 1009843A
Authority
FR
France
Prior art keywords
pit prop
prop
pit
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
Arnold Haarmann
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 FR1009843A publication Critical patent/FR1009843A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D15/42—Telescopic props with parts held relatively to each other by friction or gripping with special parts to influence the friction
FR1009843D 1948-06-30 1948-06-30 Pit prop Expired FR1009843A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1009843T 1948-06-30

Publications (1)

Publication Number Publication Date
FR1009843A true FR1009843A (en) 1952-06-04

Family

ID=9568511

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1009843D Expired FR1009843A (en) 1948-06-30 1948-06-30 Pit prop

Country Status (1)

Country Link
FR (1) FR1009843A (en)

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