Method of using rolling mill piercing points,申请号US19290388043-传众专利搜索

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发明名称	Method of using rolling mill piercing points
摘要
申请公布号	US1807454(A)	申请公布日期	1931.05.26
申请号	US19290388043	申请日期	1929.08.23
申请人	TIELKE HOMER F	发明人	TIELKE HOMER F.
分类号	B21B25/00	主分类号	B21B25/00
代理机构		代理人
主权项
地址

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