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发明名称
摘要
申请公布号	SU397253(A1)	申请公布日期	1973.09.17
申请号	SU19711609712	申请日期	1971.01.07
申请人		发明人
分类号	B21D28/14;(IPC1-7):B21D28/14	主分类号	B21D28/14
代理机构		代理人
主权项
地址

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