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发明名称
Improvements in or relating to drill bits
摘要
申请公布号
GB671193(A)
申请公布日期
1952.04.30
申请号
GB19500017447
申请日期
1950.07.12
申请人
THE TIMKEN ROLLER BEARING COMPANY
发明人
分类号
E21B10/58
主分类号
E21B10/58
代理机构
代理人
主权项
地址
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