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发明名称
ROTARY CONE DRILL BIT WITH ENHANCED THRUST BEARING FLANGE
摘要
申请公布号
EP1051561(A1)
申请公布日期
2000.11.15
申请号
EP19990902442
申请日期
1999.01.25
申请人
DRESSER INDUSTRIES INC.
发明人
CRAWFORD, MICHAEL, B.
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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