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发明名称
Расширитель для бурения шахт
摘要
申请公布号
SU79128(A1)
申请公布日期
1949.11.30
申请号
SU19490393280
申请日期
1949.03.12
申请人
ARUTYUNOV I.S.
发明人
ARUTYUNOV I.S.
分类号
E21B7/28
主分类号
E21B7/28
代理机构
代理人
主权项
地址
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