JPS6220548Y2 - - Google Patents
Info
- Publication number
- JPS6220548Y2 JPS6220548Y2 JP15682380U JP15682380U JPS6220548Y2 JP S6220548 Y2 JPS6220548 Y2 JP S6220548Y2 JP 15682380 U JP15682380 U JP 15682380U JP 15682380 U JP15682380 U JP 15682380U JP S6220548 Y2 JPS6220548 Y2 JP S6220548Y2
- Authority
- JP
- Japan
- Prior art keywords
- boom
- hole
- tip
- drilling
- frame body
- 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.)
- Expired
Links
- 238000005553 drilling Methods 0.000 claims description 25
- 239000000446 fuel Substances 0.000 claims 2
- 238000010276 construction Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15682380U JPS6220548Y2 (en]) | 1980-10-31 | 1980-10-31 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15682380U JPS6220548Y2 (en]) | 1980-10-31 | 1980-10-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5779686U JPS5779686U (en]) | 1982-05-17 |
JPS6220548Y2 true JPS6220548Y2 (en]) | 1987-05-25 |
Family
ID=29515961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15682380U Expired JPS6220548Y2 (en]) | 1980-10-31 | 1980-10-31 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6220548Y2 (en]) |
-
1980
- 1980-10-31 JP JP15682380U patent/JPS6220548Y2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5779686U (en]) | 1982-05-17 |
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