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发明名称
摘要
申请公布号
BE720914(A)
申请公布日期
1969.03.03
申请号
BED720914
申请日期
1968.09.16
申请人
发明人
分类号
B21C23/00;B21C23/22
主分类号
B21C23/00
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代理人
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地址
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