JPH0354890U - - Google Patents
Info
- Publication number
- JPH0354890U JPH0354890U JP11579489U JP11579489U JPH0354890U JP H0354890 U JPH0354890 U JP H0354890U JP 11579489 U JP11579489 U JP 11579489U JP 11579489 U JP11579489 U JP 11579489U JP H0354890 U JPH0354890 U JP H0354890U
- Authority
- JP
- Japan
- Prior art keywords
- casing
- roller bit
- groove
- face
- center shaft
- 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
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11579489U JPH0354890U (es) | 1989-10-03 | 1989-10-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11579489U JPH0354890U (es) | 1989-10-03 | 1989-10-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0354890U true JPH0354890U (es) | 1991-05-27 |
Family
ID=31664112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11579489U Pending JPH0354890U (es) | 1989-10-03 | 1989-10-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0354890U (es) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0114296B2 (es) * | 1981-10-21 | 1989-03-10 | Nisshin Steel Co Ltd |
-
1989
- 1989-10-03 JP JP11579489U patent/JPH0354890U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0114296B2 (es) * | 1981-10-21 | 1989-03-10 | Nisshin Steel Co Ltd |
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