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发明名称
Improvements relating to slant drilling apparatus
摘要
申请公布号
GB2096204(A)
申请公布日期
1982.10.13
申请号
GB19810010695
申请日期
1981.04.06
申请人
BRITISH GAS CORP
发明人
分类号
E21B15/04;E21B19/14;(IPC1-7):E21B15/04
主分类号
E21B15/04
代理机构
代理人
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