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发明名称
IMPREGNATED BIT WITH CHANGEABLE HYDRAULIC NOZZLES
摘要
申请公布号
EP2102444(A2)
申请公布日期
2009.09.23
申请号
EP20070862646
申请日期
2007.12.07
申请人
BAKER HUGHES INCORPORATED
发明人
RICHERT, VOLKER
分类号
E21B10/42;E21B10/60;E21B10/61
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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