| 发明名称 |
Device for changing bore crowns |
| 摘要 |
A device for changing bore crowns on a drill rod including a bore crown magazine member and means for automatically stopping and locking the magazine member in a desired rotated position.
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| 申请公布号 |
US4065845(A) |
申请公布日期 |
1978.01.03 |
| 申请号 |
US19750569985 |
申请日期 |
1975.04.21 |
| 申请人 |
OY TAMPELLA AB |
发明人 |
STROM, ROLF;HEIKKILA, VEIKKO;HAKKINEN, LEO |
| 分类号 |
E21B19/18;(IPC1-7):B23Q3/15;E21C19/04 |
主分类号 |
E21B19/18 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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