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经营范围
发明名称
Drill bit cutting array having discontinuities therein.
摘要
申请公布号
EP0446765(B1)
申请公布日期
1995.04.26
申请号
EP19910103334
申请日期
1991.03.05
申请人
NORTON COMPANY
发明人
CHOW, JACOB;HORTON, RALPH M.;JONES, MARK L.
分类号
E21B10/48;E21B10/54;(IPC1-7):E21B10/46
主分类号
E21B10/48
代理机构
代理人
主权项
地址
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