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经营范围
发明名称
Drilling and hole enlargement device
摘要
申请公布号
GB2446294(B)
申请公布日期
2009.11.11
申请号
GB20080001834
申请日期
2008.01.31
申请人
SMITH INTERNATIONAL INC
发明人
ALEXANDER CRAIG MACKAY;GEORGE ARMANDO ESPIRITU;CHARLES H. DEWEY
分类号
E21B10/32;E21B21/10
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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