Method of producing steel rails,申请号US19300476868-传众专利搜索

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发明名称	Method of producing steel rails
摘要
申请公布号	US2087346(A)	申请公布日期	1937.07.20
申请号	US19300476868	申请日期	1930.08.21
申请人	UNITED STATES STEEL CORPORATION	发明人	JOHNSTON JOHN
分类号	C21D1/84;C21D9/04	主分类号	C21D1/84
代理机构		代理人
主权项
地址

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