NL74988C - - Google Patents
Info
- Publication number
- NL74988C NL74988C NL74988DA NL74988C NL 74988 C NL74988 C NL 74988C NL 74988D A NL74988D A NL 74988DA NL 74988 C NL74988 C NL 74988C
- 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)
- Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP56413A DE829436C (de) | 1949-09-30 | 1949-09-30 | Stahlkappenverbindung fuer den Strebausbau im Grubenbetrieb |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL74988C true NL74988C (en:Method) |
Family
ID=7388420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL74988D NL74988C (en:Method) | 1949-09-30 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE500611A (en:Method) |
| DE (1) | DE829436C (en:Method) |
| NL (1) | NL74988C (en:Method) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2991097A (en) * | 1948-07-08 | 1961-07-04 | Vanwersch Aloys | Connecting structure for beams of a roof support or the like |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1097388B (de) * | 1952-05-29 | 1961-01-19 | Aloys Vanwersch | Kappenverbindung fuer den Strebausbau |
-
0
- NL NL74988D patent/NL74988C/xx active
- BE BE500611D patent/BE500611A/xx unknown
-
1949
- 1949-09-30 DE DEP56413A patent/DE829436C/de not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2991097A (en) * | 1948-07-08 | 1961-07-04 | Vanwersch Aloys | Connecting structure for beams of a roof support or the like |
Also Published As
| Publication number | Publication date |
|---|---|
| BE500611A (en:Method) | |
| DE829436C (de) | 1952-01-24 |