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发明名称
Drilling boreholes
摘要
申请公布号
GB2043747(A)
申请公布日期
1980.10.08
申请号
GB19800002185
申请日期
1980.01.23
申请人
STANDARD OIL CO
发明人
分类号
E21B7/06;E21B44/00;E21B47/00;E21B47/022;E21B47/04;(IPC1-7):E21B47/12
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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