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发明名称
Rock-bit and rock-bit seal
摘要
申请公布号
GB0518765(D0)
申请公布日期
2005.10.19
申请号
GB20050018765
申请日期
2005.09.14
申请人
SMITH INTERNATIONAL, INC.
发明人
分类号
E21B10/25
主分类号
E21B10/25
代理机构
代理人
主权项
地址
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