NL74919C - - Google Patents
Info
- Publication number
- NL74919C NL74919C NL74919DA NL74919C NL 74919 C NL74919 C NL 74919C NL 74919D A NL74919D A NL 74919DA NL 74919 C NL74919 C NL 74919C
- 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 |
|---|---|---|---|
| DE698672X | 1949-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL74919C true NL74919C (no) |
Family
ID=6608226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL74919D NL74919C (no) | 1949-09-19 |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB698672A (no) |
| NL (1) | NL74919C (no) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2884272A (en) * | 1955-01-19 | 1959-04-28 | Hans Gerlach | Roof support structure for mine workings |
-
0
- NL NL74919D patent/NL74919C/xx active
-
1950
- 1950-04-13 GB GB9157/50A patent/GB698672A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB698672A (en) | 1953-10-21 |