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经营范围
发明名称
A ball-activated tool for use in a drill string
摘要
申请公布号
GB0407449(D0)
申请公布日期
2004.05.05
申请号
GB20040007449
申请日期
2004.04.01
申请人
LEE, PAUL B
发明人
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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