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发明名称
Drill bit assembly
摘要
申请公布号
GB2431954(A)
申请公布日期
2007.05.09
申请号
GB20070004097
申请日期
2007.03.02
申请人
ARDIS L HOLTE;TIMOTHY W CONN
发明人
ARDIS L HOLTE;TIMOTHY W CONN
分类号
E21B10/40;E21B10/64
主分类号
E21B10/40
代理机构
代理人
主权项
地址
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