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发明名称
Earth-boring bit with improved bearing seal
摘要
申请公布号
GB9827666(D0)
申请公布日期
1999.02.10
申请号
GB19980027666
申请日期
1998.12.17
申请人
BAKER HUGHES INCORPORATED
发明人
分类号
E21B10/22;E21B10/25;F16J15/34
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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