JPH0211891U - - Google Patents
Info
- Publication number
- JPH0211891U JPH0211891U JP8946888U JP8946888U JPH0211891U JP H0211891 U JPH0211891 U JP H0211891U JP 8946888 U JP8946888 U JP 8946888U JP 8946888 U JP8946888 U JP 8946888U JP H0211891 U JPH0211891 U JP H0211891U
- Authority
- JP
- Japan
- Prior art keywords
- steel rod
- drilling tool
- free surface
- rock
- type drilling
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 5
- 238000009527 percussion Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Earth Drilling (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8946888U JPH0211891U (2) | 1988-07-07 | 1988-07-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8946888U JPH0211891U (2) | 1988-07-07 | 1988-07-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0211891U true JPH0211891U (2) | 1990-01-25 |
Family
ID=31314018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8946888U Pending JPH0211891U (2) | 1988-07-07 | 1988-07-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0211891U (2) |
-
1988
- 1988-07-07 JP JP8946888U patent/JPH0211891U/ja active Pending
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