NL72424C - - Google Patents
Info
- Publication number
- NL72424C NL72424C NL72424DA NL72424C NL 72424 C NL72424 C NL 72424C NL 72424D A NL72424D A NL 72424DA NL 72424 C NL72424 C NL 72424C
- 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)
- Bridges Or Land Bridges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE674397X | 1950-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL72424C true NL72424C (en:Method) |
Family
ID=6591034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL72424D NL72424C (en:Method) | 1950-03-09 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE496301A (en:Method) |
| FR (1) | FR1025194A (en:Method) |
| GB (1) | GB674397A (en:Method) |
| NL (1) | NL72424C (en:Method) |
-
0
- NL NL72424D patent/NL72424C/xx active
- BE BE496301D patent/BE496301A/xx unknown
-
1950
- 1950-04-20 GB GB9704/50A patent/GB674397A/en not_active Expired
- 1950-09-27 FR FR1025194D patent/FR1025194A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB674397A (en) | 1952-06-25 |
| FR1025194A (fr) | 1953-04-13 |
| BE496301A (en:Method) |