NL229339A - - Google Patents
Info
- Publication number
- NL229339A NL229339A NL229339DA NL229339A NL 229339 A NL229339 A NL 229339A NL 229339D A NL229339D A NL 229339DA NL 229339 A NL229339 A NL 229339A
- Authority
- NL
- Netherlands
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)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2112157A GB891140A (en) | 1957-07-04 | 1957-07-04 | Improvements in or relating to mine roof supporting bars |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL229339A true NL229339A (en:Method) |
Family
ID=10157548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL229339D NL229339A (en:Method) | 1957-07-04 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE569133A (en:Method) |
| FR (1) | FR1207659A (en:Method) |
| GB (1) | GB891140A (en:Method) |
| NL (1) | NL229339A (en:Method) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1289805B (de) * | 1962-01-29 | 1969-02-27 | Groetschel Karl Maria | Mechanisch rueckbare Strebausbaueinheit |
-
0
- NL NL229339D patent/NL229339A/xx unknown
- BE BE569133D patent/BE569133A/xx unknown
-
1957
- 1957-07-04 GB GB2112157A patent/GB891140A/en not_active Expired
-
1958
- 1958-07-03 FR FR1207659D patent/FR1207659A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE569133A (en:Method) | |
| GB891140A (en) | 1962-03-14 |
| FR1207659A (fr) | 1960-02-18 |