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发明名称
摘要
申请公布号
SU364364(A1)
申请公布日期
1972.12.28
申请号
SU19711652326
申请日期
1971.04.26
申请人
发明人
分类号
B21B19/00;(IPC1-7):B21B19/00
主分类号
B21B19/00
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代理人
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