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发明名称
Drag bit with utility blades
摘要
申请公布号
GB2452629(B)
申请公布日期
2012.01.11
申请号
GB20080016298
申请日期
2008.09.05
申请人
SMITH INTERNATIONAL INC
发明人
YUELIN SHEN;YOUHE ZHANG
分类号
E21B10/42;E21B10/43;E21B10/60
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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