DE2025293A1 - - Google Patents
Info
- Publication number
- DE2025293A1 DE2025293A1 DE19702025293 DE2025293A DE2025293A1 DE 2025293 A1 DE2025293 A1 DE 2025293A1 DE 19702025293 DE19702025293 DE 19702025293 DE 2025293 A DE2025293 A DE 2025293A DE 2025293 A1 DE2025293 A1 DE 2025293A1
- Authority
- DE
- Germany
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
- E21D23/26—Hydraulic or pneumatic control
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)
- Mechanically-Actuated Valves (AREA)
- Lining And Supports For Tunnels (AREA)
- Multiple-Way Valves (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2687269 | 1969-05-28 | ||
GB2687269 | 1969-05-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2025293A1 true DE2025293A1 (pl) | 1972-03-09 |
DE2025293C2 DE2025293C2 (de) | 1976-08-26 |
Family
ID=
Also Published As
Publication number | Publication date |
---|---|
PL72769B1 (pl) | 1974-08-30 |
JPS5126362B1 (pl) | 1976-08-06 |
US3661056A (en) | 1972-05-09 |
CA919925A (en) | 1973-01-30 |
ZA703511B (en) | 1971-01-27 |
GB1295079A (pl) | 1972-11-01 |
FR2048819A5 (pl) | 1971-03-19 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
E77 | Valid patent as to the heymanns-index 1977 | ||
EHJ | Ceased/non-payment of the annual fee |