BE491885A - - Google Patents
Info
- Publication number
- BE491885A BE491885A BE491885DA BE491885A BE 491885 A BE491885 A BE 491885A BE 491885D A BE491885D A BE 491885DA BE 491885 A BE491885 A BE 491885A
- Authority
- BE
- Belgium
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/02—Cantilever extension or similar protecting devices
- E21D17/08—Cap joints for obtaining a coal-face free of pit-props
- E21D17/086—Cap joints for obtaining a coal-face free of pit-props or articulated type
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Connection Of Plates (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1642549A GB679479A (en) | 1949-06-21 | 1949-06-21 | Roof support for use in mines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE491885A true BE491885A (US08197722-20120612-C00042.png) | 1949-11-14 |
Family
ID=10077092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE491885D BE491885A (US08197722-20120612-C00042.png) | 1949-06-21 | 1949-10-22 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE491885A (US08197722-20120612-C00042.png) |
| FR (1) | FR989994A (US08197722-20120612-C00042.png) |
| GB (1) | GB679479A (US08197722-20120612-C00042.png) |
-
1949
- 1949-06-21 GB GB1642549A patent/GB679479A/en not_active Expired
- 1949-07-01 FR FR989994D patent/FR989994A/fr not_active Expired
- 1949-10-22 BE BE491885D patent/BE491885A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR989994A (fr) | 1951-09-25 |
| GB679479A (en) | 1952-09-17 |
