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发明名称
摘要
申请公布号
SU549194(A1)
申请公布日期
1977.03.05
申请号
SU19752160080
申请日期
1975.07.28
申请人
发明人
分类号
B21C1/32;(IPC1-7):B21C1/32
主分类号
B21C1/32
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