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发明名称
Ball-activated by-pass tool for use in a drilling operation
摘要
申请公布号
GB0512125(D0)
申请公布日期
2005.07.20
申请号
GB20050012125
申请日期
2005.06.15
申请人
LEE, PAUL B
发明人
分类号
主分类号
代理机构
代理人
主权项
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