FR1343417A - advanced hydro-pneumatic prop - Google Patents

advanced hydro-pneumatic prop

Info

Publication number
FR1343417A
FR1343417A FR921438A FR921438A FR1343417A FR 1343417 A FR1343417 A FR 1343417A FR 921438 A FR921438 A FR 921438A FR 921438 A FR921438 A FR 921438A FR 1343417 A FR1343417 A FR 1343417A
Authority
FR
France
Prior art keywords
prop
hydro
pneumatic
advanced
pneumatic prop
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
FR921438A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LEDEEN Inc
Original Assignee
LEDEEN Inc
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
Priority claimed from US180591A external-priority patent/US3191506A/en
Application filed by LEDEEN Inc filed Critical LEDEEN Inc
Priority to FR921438A priority Critical patent/FR1343417A/en
Application granted granted Critical
Publication of FR1343417A publication Critical patent/FR1343417A/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
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • 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
    • E21D15/60—Devices for withdrawing props or chocks
FR921438A 1962-03-19 1963-01-15 advanced hydro-pneumatic prop Expired FR1343417A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR921438A FR1343417A (en) 1962-03-19 1963-01-15 advanced hydro-pneumatic prop

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US180591A US3191506A (en) 1962-03-19 1962-03-19 Hydropneumatic prop
FR921438A FR1343417A (en) 1962-03-19 1963-01-15 advanced hydro-pneumatic prop

Publications (1)

Publication Number Publication Date
FR1343417A true FR1343417A (en) 1963-11-15

Family

ID=26199362

Family Applications (1)

Application Number Title Priority Date Filing Date
FR921438A Expired FR1343417A (en) 1962-03-19 1963-01-15 advanced hydro-pneumatic prop

Country Status (1)

Country Link
FR (1) FR1343417A (en)

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