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发明名称
Improvements in elements faced with superhard material
摘要
申请公布号
GB9809690(D0)
申请公布日期
1998.07.01
申请号
GB19980009690
申请日期
1998.05.08
申请人
CAMCO INTERNATIONAL (UK) LIMITED
发明人
分类号
E21B10/56;E21B10/567;E21B10/573
主分类号
E21B10/56
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