BE516921A - - Google Patents
Info
- Publication number
- BE516921A BE516921A BE516921DA BE516921A BE 516921 A BE516921 A BE 516921A BE 516921D A BE516921D A BE 516921DA BE 516921 A BE516921 A BE 516921A
- 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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE775754X | 1952-01-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE516921A true BE516921A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Family
ID=6686367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE516921D BE516921A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1952-01-16 |
Country Status (3)
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2959924A (en) * | 1954-01-29 | 1960-11-15 | Groetschel Karl Maria | Connection for lagging irons |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3163011A (en) * | 1960-11-14 | 1964-12-29 | Karl M Groetschel | Connection for lagging irons |
-
0
- BE BE516921D patent/BE516921A/xx unknown
-
1952
- 1952-12-18 GB GB32130/52A patent/GB775754A/en not_active Expired
-
1953
- 1953-01-13 FR FR1069856D patent/FR1069856A/fr not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2959924A (en) * | 1954-01-29 | 1960-11-15 | Groetschel Karl Maria | Connection for lagging irons |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1069856A (fr) | 1954-07-13 |
| GB775754A (en) | 1957-05-29 |