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发明名称
Earth boring bit with improved bearing seal
摘要
申请公布号
EP0757154(A3)
申请公布日期
1998.07.08
申请号
EP19960305712
申请日期
1996.08.02
申请人
BAKER HUGHES INCORPORATED
发明人
DOLEZAL, GEORGE E.;HARRIS, THOMAS M.
分类号
E21B10/22;E21B10/25;(IPC1-7):E21B10/22
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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