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发明名称
摘要
申请公布号
JPS4939553(A)
申请公布日期
1974.04.13
申请号
JP19720084001
申请日期
1972.08.21
申请人
发明人
分类号
B21F3/04;B21D11/06;B21F7/00
主分类号
B21F3/04
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代理人
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