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发明名称
DRILL BIT HAVING ENHANCED STABILITY
摘要
申请公布号
US5178222(A)
申请公布日期
1993.01.12
申请号
US19910728641
申请日期
1991.07.11
申请人
BAKER HUGHES INCORPORATED
发明人
JONES, MARK L.;HANSEN, WAYNE R.
分类号
E21B10/42;E21B10/43;E21B10/46;E21B17/10
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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