JPH0477688U - - Google Patents
Info
- Publication number
- JPH0477688U JPH0477688U JP12133990U JP12133990U JPH0477688U JP H0477688 U JPH0477688 U JP H0477688U JP 12133990 U JP12133990 U JP 12133990U JP 12133990 U JP12133990 U JP 12133990U JP H0477688 U JPH0477688 U JP H0477688U
- Authority
- JP
- Japan
- Prior art keywords
- drilling bit
- arc
- hammer body
- tip
- bit
- Prior art date
- 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
- 238000005553 drilling Methods 0.000 claims description 7
Landscapes
- Earth Drilling (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12133990U JPH0721677Y2 (ja) | 1990-11-19 | 1990-11-19 | ２重管式掘削ビット |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12133990U JPH0721677Y2 (ja) | 1990-11-19 | 1990-11-19 | ２重管式掘削ビット |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0477688U true JPH0477688U (da) | 1992-07-07 |
| JPH0721677Y2 JPH0721677Y2 (ja) | 1995-05-17 |
Family
ID=31869198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12133990U Expired - Lifetime JPH0721677Y2 (ja) | 1990-11-19 | 1990-11-19 | ２重管式掘削ビット |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0721677Y2 (da) |
-
1990
- 1990-11-19 JP JP12133990U patent/JPH0721677Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0721677Y2 (ja) | 1995-05-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |