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经营范围
发明名称
Seal assembly and drill bit
摘要
申请公布号
GB0511994(D0)
申请公布日期
2005.07.20
申请号
GB20050011994
申请日期
2005.06.13
申请人
SMITH INTERNATIONAL, INC.
发明人
分类号
E21B10/00;E21B10/08;E21B10/22;E21B10/25;F16J15/18
主分类号
E21B10/00
代理机构
代理人
主权项
地址
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