FR1549904A - - Google Patents
Info
- Publication number
- FR1549904A FR1549904A FR1549904DA FR1549904A FR 1549904 A FR1549904 A FR 1549904A FR 1549904D A FR1549904D A FR 1549904DA FR 1549904 A FR1549904 A FR 1549904A
- Authority
- FR
- France
- 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.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C27/00—Machines which completely free the mineral from the seam
- E21C27/01—Machines which completely free the mineral from the seam specially adapted for removing overhanging coal
-
- 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
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
- E21D23/06—Special mine caps or special tops of pit-props for permitting step-by-step movement
- E21D23/063—Retractable cantilever extensions therefor
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)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL118299A PL56867B1 (instruction) | 1967-01-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR1549904A true FR1549904A (instruction) | 1968-12-13 |
Family
ID=19949590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR1549904D Expired FR1549904A (instruction) | 1967-01-02 | 1968-01-02 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE708882A (instruction) |
| FR (1) | FR1549904A (instruction) |
-
1968
- 1968-01-02 FR FR1549904D patent/FR1549904A/fr not_active Expired
- 1968-01-02 BE BE708882D patent/BE708882A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE708882A (instruction) | 1968-05-16 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |