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发明名称
DRILL BITS WITH BEARING ELEMENTS FOR REDUCING EXPOSURE OF CUTTERS
摘要
申请公布号
EP1971749(A2)
申请公布日期
2008.09.24
申请号
EP20060845458
申请日期
2006.12.14
申请人
BAKER HUGHES INCORPORATED
发明人
GANZ, THOMAS
分类号
E21B10/42
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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