JPS577274B2 - - Google Patents
Info
- Publication number
- JPS577274B2 JPS577274B2 JP6906479A JP6906479A JPS577274B2 JP S577274 B2 JPS577274 B2 JP S577274B2 JP 6906479 A JP6906479 A JP 6906479A JP 6906479 A JP6906479 A JP 6906479A JP S577274 B2 JPS577274 B2 JP S577274B2
- 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 (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6906479A JPS55161190A (en) | 1979-06-01 | 1979-06-01 | Hole expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6906479A JPS55161190A (en) | 1979-06-01 | 1979-06-01 | Hole expander |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55161190A JPS55161190A (en) | 1980-12-15 |
| JPS577274B2 true JPS577274B2 (ja) | 1982-02-09 |
Family
ID=13391760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6906479A Granted JPS55161190A (en) | 1979-06-01 | 1979-06-01 | Hole expander |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55161190A (ja) |
-
1979
- 1979-06-01 JP JP6906479A patent/JPS55161190A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55161190A (en) | 1980-12-15 |