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发明名称
摘要
申请公布号	SU521984(A1)	申请公布日期	1976.07.25
申请号	SU19742027820	申请日期	1974.05.28
申请人		发明人
分类号	B21J7/20;(IPC1-7):B21J7/20	主分类号	B21J7/20
代理机构		代理人
主权项
地址

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