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经营范围
发明名称
Roller cone drill bit having non-axisymmetric cutting elements oriented to optimise drilling performance
摘要
申请公布号
GB0120044(D0)
申请公布日期
2001.10.10
申请号
GB20010020044
申请日期
2001.08.16
申请人
发明人
分类号
E21B10/16
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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