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经营范围
发明名称
Drill bit,cutting structure and cutting element
摘要
申请公布号
GB9720245(D0)
申请公布日期
1997.11.26
申请号
GB19970020245
申请日期
1997.09.23
申请人
SMITH INTERNATIONAL INC
发明人
分类号
E21B10/42;E21B10/43;E21B10/56;E21B10/567;E21B10/60
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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