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发明名称
摘要
申请公布号
JPS56105346(U)
申请公布日期
1981.08.17
申请号
JP19800004221U
申请日期
1980.01.16
申请人
发明人
分类号
B21F31/00;(IPC1-7):B21F31/00
主分类号
B21F31/00
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代理人
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