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发明名称
DOWN-HOLE FINISHING TOOL
摘要
申请公布号
SU1162941(A1)
申请公布日期
1985.06.23
申请号
SU19843697590
申请日期
1984.02.07
申请人
VASILEV VALENTIN YU,SU
发明人
VASILEV VALENTIN YU,SU
分类号
E21B31/12;(IPC1-7):E21B31/12
主分类号
E21B31/12
代理机构
代理人
主权项
地址
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