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发明名称
DRILL STRING ELEMENT
摘要
申请公布号
IE891332(L)
申请公布日期
1989.10.26
申请号
IE19890001332
申请日期
1989.04.25
申请人
SANDVIK AB
发明人
分类号
E21B10/00;(IPC1-7):E21B10/00
主分类号
E21B10/00
代理机构
代理人
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