FR832047A - ? for mines - Google Patents
? for minesInfo
- Publication number
- FR832047A FR832047A FR832047DA FR832047A FR 832047 A FR832047 A FR 832047A FR 832047D A FR832047D A FR 832047DA FR 832047 A FR832047 A FR 832047A
- Authority
- FR
- France
- Prior art keywords
- mines
- 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
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
- E21D15/18—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with one part resting on a supporting medium, e.g. rubber, sand, bitumen, lead, located in the other part, with or without expulsion or displacement of the medium upon excessive pressure
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 |
---|---|---|---|
FR832047T | 1938-01-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR832047A true FR832047A (en) | 1938-09-20 |
Family
ID=9295397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR832047D Expired FR832047A (en) | 1938-01-13 | 1938-01-13 | ? for mines |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR832047A (en) |
-
1938
- 1938-01-13 FR FR832047D patent/FR832047A/en not_active Expired
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