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发明名称
摘要
申请公布号
NL6916824(A)
申请公布日期
1970.06.09
申请号
NL19690016824
申请日期
1969.11.07
申请人
发明人
分类号
B21C37/08;(IPC1-7):B21D15/02;B21D17/00
主分类号
B21C37/08
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代理人
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