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发明名称
LOCK FOR DOWNHOLE APPARATUS
摘要
申请公布号
SG47793(G)
申请公布日期
1993.06.25
申请号
SG19930000477
申请日期
1993.04.16
申请人
HALLIBURTON CO
发明人
分类号
E21B23/04;E21B33/124;(IPC1-7):E21B23/04
主分类号
E21B23/04
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