JPH01156294U - - Google Patents
Info
- Publication number
- JPH01156294U JPH01156294U JP5273188U JP5273188U JPH01156294U JP H01156294 U JPH01156294 U JP H01156294U JP 5273188 U JP5273188 U JP 5273188U JP 5273188 U JP5273188 U JP 5273188U JP H01156294 U JPH01156294 U JP H01156294U
- Authority
- JP
- Japan
- Prior art keywords
- air
- cover
- drill bit
- suction fan
- bottom wall
- 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
- 230000002265 prevention Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 claims 1
Landscapes
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Earth Drilling (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5273188U JPH01156294U (et) | 1988-04-21 | 1988-04-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5273188U JPH01156294U (et) | 1988-04-21 | 1988-04-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01156294U true JPH01156294U (et) | 1989-10-26 |
Family
ID=31278733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5273188U Pending JPH01156294U (et) | 1988-04-21 | 1988-04-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01156294U (et) |
-
1988
- 1988-04-21 JP JP5273188U patent/JPH01156294U/ja active Pending