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发明名称
MEJORAS INTRODUCIDAS EN LAS BARRENAS ROTATIVAS DE PERCUSIoN
摘要
申请公布号
ES185250(A1)
申请公布日期
1949.01.16
申请号
ES19500001852
申请日期
1948.09.16
申请人
THE TINKEN ROLLER BEARING COMPANY
发明人
分类号
E21B17/04;(IPC1-7):E21B17/04
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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