FR623292A - - Google Patents
Info
- Publication number
- FR623292A FR623292A FR623292DA FR623292A FR 623292 A FR623292 A FR 623292A FR 623292D A FR623292D A FR 623292DA FR 623292 A FR623292 A FR 623292A
- Authority
- FR
- France
- 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
- E21C—MINING OR QUARRYING
- E21C27/00—Machines which completely free the mineral from the seam
- E21C27/20—Mineral freed by means not involving slitting
- E21C27/22—Mineral freed by means not involving slitting by rotary drills with breaking-down means, e.g. wedge-shaped drills, i.e. the rotary axis of the tool carrier being substantially perpendicular to the working face, e.g. MARIETTA-type
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR623292A true FR623292A (fr) | 1927-06-21 |
Family
ID=1541277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR623292D Expired FR623292A (fr) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR623292A (fr) |
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0
- FR FR623292D patent/FR623292A/fr not_active Expired