BE570620A - - Google Patents
Info
- Publication number
- BE570620A BE570620A BE570620A BE570620A BE570620A BE 570620 A BE570620 A BE 570620A BE 570620 A BE570620 A BE 570620A BE 570620 A BE570620 A BE 570620A BE 570620 A BE570620 A BE 570620A
- Authority
- BE
- Belgium
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2462858A GB848534A (en) | 1958-07-31 | 1958-07-31 | Mine roof bars |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE570620A true BE570620A (en) | 1958-09-15 |
Family
ID=10214697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE570620A BE570620A (en) | 1958-07-31 | 1958-08-25 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE570620A (en) |
| FR (1) | FR1210085A (en) |
| GB (1) | GB848534A (en) |
-
1958
- 1958-07-31 GB GB2462858A patent/GB848534A/en not_active Expired
- 1958-08-23 FR FR1210085D patent/FR1210085A/en not_active Expired
- 1958-08-25 BE BE570620A patent/BE570620A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR1210085A (en) | 1960-03-07 |
| GB848534A (en) | 1960-09-21 |