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经营范围
发明名称
Drill bit
摘要
申请公布号
GB9616784(D0)
申请公布日期
1996.09.25
申请号
GB19960016784
申请日期
1994.01.25
申请人
BAKER HUGHES INCORPORATED
发明人
分类号
E21B10/32;E21B10/62
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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