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发明名称
摘要
申请公布号
SU431928(A1)
申请公布日期
1974.06.15
申请号
SU19731870715
申请日期
1973.01.15
申请人
发明人
分类号
B21D22/10;(IPC1-7):B21D22/10
主分类号
B21D22/10
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