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经营范围
发明名称
DRILLING HEAD
摘要
申请公布号
EP0944764(A1)
申请公布日期
1999.09.29
申请号
EP19970949845
申请日期
1997.12.16
申请人
DRESSER INDUSTRIES INC.
发明人
LAMINE, ETIENNE;DELWICHE, ROBERT
分类号
E21B10/46;E21B10/54;(IPC1-7):E21B10/54
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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