FR492187A - Improvements in rock drills - Google Patents
Improvements in rock drillsInfo
- Publication number
- FR492187A FR492187A FR492187DA FR492187A FR 492187 A FR492187 A FR 492187A FR 492187D A FR492187D A FR 492187DA FR 492187 A FR492187 A FR 492187A
- Authority
- FR
- France
- Prior art keywords
- rock drills
- drills
- rock
- 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
- 239000011435 rock Substances 0.000 title 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/106—Making by using boring or cutting machines with percussive tools, e.g. pick-hammers
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological 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 |
---|---|---|---|
FR492187T | 1916-08-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR492187A true FR492187A (en) | 1919-07-01 |
Family
ID=1528099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR492187D Expired FR492187A (en) | 1916-08-28 | 1916-08-28 | Improvements in rock drills |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR492187A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2307122A1 (en) * | 1975-04-08 | 1976-11-05 | United Kingdom Government | HYDRAULIC PERCUSSION DEVICE |
-
1916
- 1916-08-28 FR FR492187D patent/FR492187A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2307122A1 (en) * | 1975-04-08 | 1976-11-05 | United Kingdom Government | HYDRAULIC PERCUSSION DEVICE |
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