FR996969A - metal prop - Google Patents
metal propInfo
- Publication number
- FR996969A FR996969A FR996969DA FR996969A FR 996969 A FR996969 A FR 996969A FR 996969D A FR996969D A FR 996969DA FR 996969 A FR996969 A FR 996969A
- Authority
- FR
- France
- Prior art keywords
- metal prop
- prop
- metal
- 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
Links
- 239000002184 metal Substances 0.000 title 1
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
- E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
- E21D15/20—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with pawl, pin, cross-piece, or the like engaging with ratchet teeth, notches, holes, or the like, spaced apart at intervals
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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR996969T | 1949-09-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR996969A true FR996969A (en) | 1951-12-31 |
Family
ID=9558313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR996969D Expired FR996969A (en) | 1949-09-07 | 1949-09-07 | metal prop |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR996969A (en) |
-
1949
- 1949-09-07 FR FR996969D patent/FR996969A/en not_active Expired
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