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经营范围
发明名称
DRILL BIT AND IMPROVED CUTTING ELEMENT
摘要
申请公布号
EP0117241(B1)
申请公布日期
1987.05.20
申请号
EP19840850034
申请日期
1984.02.01
申请人
STRATA BIT CORPORATION
发明人
MORRIS, WILFORD VICTOR
分类号
E21B10/56;E21B10/567;(IPC1-7):E21B10/46
主分类号
E21B10/56
代理机构
代理人
主权项
地址
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