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经营范围
发明名称
Modular rotary drill bit
摘要
申请公布号
US5439068(B1)
申请公布日期
1997.01.14
申请号
US19940287446
申请日期
1994.08.08
申请人
DRESSER INDUSTRIES, INC.
发明人
HUFFSTUTLER ALAN D.;DIETZ WESLEY P.
分类号
E21B10/20;E21B10/24;(IPC1-7):E21B10/08
主分类号
E21B10/20
代理机构
代理人
主权项
地址
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