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经营范围
发明名称
Rotary drill bits including at least one substantially helically extending feature
摘要
申请公布号
GB0906238(D0)
申请公布日期
2009.05.20
申请号
GB20090006238
申请日期
2009.04.09
申请人
BAKER HUGHES INCORPORATED
发明人
分类号
E21B10/42;E21B10/43
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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