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发明名称
Spring mechanism for downhole steering tool blades
摘要
申请公布号
GB0920874(D0)
申请公布日期
2010.01.13
申请号
GB20090020874
申请日期
2006.02.17
申请人
SMITH INTERNATIONAL INC
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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