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发明名称
Indexing percussive drilling bit
摘要
申请公布号
GB9823023(D0)
申请公布日期
1998.12.16
申请号
GB19980023023
申请日期
1997.05.23
申请人
INGERSOLL-RAND COMPANY
发明人
分类号
E21B4/16;E21B17/07
主分类号
E21B4/16
代理机构
代理人
主权项
地址
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