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发明名称
Improved drilling methods and apparatus
摘要
申请公布号
GB0026598(D0)
申请公布日期
2000.12.13
申请号
GB20000026598
申请日期
2000.10.31
申请人
COUPLER DEVELOPMENTS LIMITED
发明人
分类号
E21B19/16;E21B21/00;E21B33/068
主分类号
E21B19/16
代理机构
代理人
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地址
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