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发明名称
ROTARY DRAG BIT
摘要
申请公布号
EP2118431(B1)
申请公布日期
2011.11.23
申请号
EP20080725403
申请日期
2008.02.11
申请人
BAKER HUGHES INCORPORATED
发明人
WELCH, ROBERT, M.;FELDERHOFF, FLOYD, C.;DOSTER, MICHAEL, L.
分类号
E21B10/43
主分类号
E21B10/43
代理机构
代理人
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