JPH01175115U - - Google Patents
Info
- Publication number
- JPH01175115U JPH01175115U JP7071588U JP7071588U JPH01175115U JP H01175115 U JPH01175115 U JP H01175115U JP 7071588 U JP7071588 U JP 7071588U JP 7071588 U JP7071588 U JP 7071588U JP H01175115 U JPH01175115 U JP H01175115U
- Authority
- JP
- Japan
- Prior art keywords
- drilling
- projecting portion
- core bit
- diamond core
- drilled
- 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
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000005553 drilling Methods 0.000 claims 3
- 230000002265 prevention Effects 0.000 claims 1
Landscapes
- Drilling And Boring (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7071588U JPH01175115U (ru) | 1988-05-27 | 1988-05-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7071588U JPH01175115U (ru) | 1988-05-27 | 1988-05-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01175115U true JPH01175115U (ru) | 1989-12-13 |
Family
ID=31295945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7071588U Pending JPH01175115U (ru) | 1988-05-27 | 1988-05-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01175115U (ru) |
-
1988
- 1988-05-27 JP JP7071588U patent/JPH01175115U/ja active Pending