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发明名称
DRILLING ASSEMBLY
摘要
申请公布号
GB2255361(A)
申请公布日期
1992.11.04
申请号
GB19920008795
申请日期
1992.04.23
申请人
* BP EXPLORATION OPERATING COMPANY LIMITED
发明人
HANS PAUL * HOPPER
分类号
E21B4/10;E21B4/16;E21B7/28;E21B10/38;E21B10/40;E21B10/58;E21B33/14
主分类号
E21B4/10
代理机构
代理人
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