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摘要
申请公布号
SU12639(A1)
申请公布日期
1930.01.31
申请号
SU19270015027
申请日期
1927.04.26
申请人
BEDNYAKOV S.I.
发明人
BEDNYAKOV S.I.
分类号
E21B27/00
主分类号
E21B27/00
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代理人
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