| 发明名称 |
Device for measuring the angular orientation of horizontal bores |
| 摘要 |
Two tubular elements are connected by a ball-and-socket joint and arrangements are provided for measuring angular displacement which occurs between the longitudinal center axes of the two elements.
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| 申请公布号 |
US4361961(A) |
申请公布日期 |
1982.12.07 |
| 申请号 |
US19810257405 |
申请日期 |
1981.04.24 |
| 申请人 |
RUHRKOHLE AG |
发明人 |
FUCHS, HEINZ |
| 分类号 |
E21B47/022;(IPC1-7):E21B47/02 |
主分类号 |
E21B47/022 |
| 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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