NL28246C - - Google Patents
Info
- Publication number
- NL28246C NL28246C NL28246DA NL28246C NL 28246 C NL28246 C NL 28246C NL 28246D A NL28246D A NL 28246DA NL 28246 C NL28246 C NL 28246C
- Authority
- NL
- Netherlands
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE663918X | 1927-11-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL28246C true NL28246C (en:Method) |
Family
ID=6589338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL28246D NL28246C (en:Method) | 1927-11-23 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR663918A (en:Method) |
| NL (1) | NL28246C (en:Method) |
-
0
- NL NL28246D patent/NL28246C/xx active
-
1928
- 1928-11-14 FR FR663918D patent/FR663918A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR663918A (fr) | 1929-08-27 |