JPS577280B2 - - Google Patents
Info
- Publication number
- JPS577280B2 JPS577280B2 JP6364377A JP6364377A JPS577280B2 JP S577280 B2 JPS577280 B2 JP S577280B2 JP 6364377 A JP6364377 A JP 6364377A JP 6364377 A JP6364377 A JP 6364377A JP S577280 B2 JPS577280 B2 JP S577280B2
- Authority
- JP
- Japan
- 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
Landscapes
- Earth Drilling (AREA)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6364377A JPS53147601A (en) | 1977-05-31 | 1977-05-31 | Device of varying diameter of bit for total section raise excavation |
| DE2815149A DE2815149C3 (de) | 1977-04-28 | 1978-04-07 | Verfahren und Vorrichtung zum Hochbrechen eines Schachtes durch Aufwärtsbohren aus dem Vollen |
| US06/895,103 US4248312A (en) | 1977-04-28 | 1978-04-10 | Method and apparatus for upwardly cutting full cutting face of a shaft without requesting workmen's hands |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6364377A JPS53147601A (en) | 1977-05-31 | 1977-05-31 | Device of varying diameter of bit for total section raise excavation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS53147601A JPS53147601A (en) | 1978-12-22 |
| JPS577280B2 true JPS577280B2 (ja) | 1982-02-09 |
Family
ID=13235231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6364377A Granted JPS53147601A (en) | 1977-04-28 | 1977-05-31 | Device of varying diameter of bit for total section raise excavation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS53147601A (ja) |
-
1977
- 1977-05-31 JP JP6364377A patent/JPS53147601A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53147601A (en) | 1978-12-22 |