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发明名称
BALL OPERATED BY-PASS TOOL FOR USE IN DRILLSTRING
摘要
申请公布号
EP1537292(B1)
申请公布日期
2009.05.13
申请号
EP20030750885
申请日期
2003.09.01
申请人
LEE, PAUL BERNARD
发明人
LEE, PAUL BERNARD
分类号
E21B21/10;E21B34/14
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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