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发明名称
Drill bit having improved cutting structure with varying diamond density
摘要
申请公布号
SG33507(A1)
申请公布日期
1996.10.18
申请号
SG19950001410
申请日期
1995.09.22
申请人
SMITH INTERNATIONAL, INC.
发明人
KEITH, CARL W.;MENSA-WILMOT GRAHAM
分类号
E21B10/46;(IPC1-7):E21B10/46
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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