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发明名称
摘要
申请公布号	JPS638842(B2)	申请公布日期	1988.02.24
申请号	JP19800123320	申请日期	1980.09.05
申请人	NIPPON STEEL CORP	发明人	YAMAMOTO HIROYASU;NAKAJIMA HIROE;UEHORI JUJI
分类号	B21B1/22	主分类号	B21B1/22
代理机构		代理人
主权项
地址

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