BE509687A - - Google Patents
Info
- Publication number
- BE509687A BE509687A BE509687DA BE509687A BE 509687 A BE509687 A BE 509687A BE 509687D A BE509687D A BE 509687DA BE 509687 A BE509687 A BE 509687A
- 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)
- Bridges Or Land Bridges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL709243X | 1951-03-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE509687A true BE509687A (en:Method) |
Family
ID=19812159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE509687D BE509687A (en:Method) | 1951-03-07 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE509687A (en:Method) |
| FR (1) | FR1059850A (en:Method) |
| GB (1) | GB709243A (en:Method) |
| NL (1) | NL77995C (en:Method) |
-
0
- NL NL77995D patent/NL77995C/xx active
- BE BE509687D patent/BE509687A/xx unknown
-
1952
- 1952-03-04 FR FR1059850D patent/FR1059850A/fr not_active Expired
- 1952-03-06 GB GB5908/52A patent/GB709243A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL77995C (en:Method) | |
| FR1059850A (fr) | 1954-03-29 |
| GB709243A (en) | 1954-05-19 |