Method of producing pressed steel hatch frames,申请号US19300502172-传众专利搜索

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发明名称	Method of producing pressed steel hatch frames
摘要
申请公布号	US1891316(A)	申请公布日期	1932.12.20
申请号	US19300502172	申请日期	1930.12.13
申请人	YOUNGSTOWN STEEL CAR CORPORATION	发明人	NYBERG OLAF J.
分类号	B21D53/74	主分类号	B21D53/74
代理机构		代理人
主权项
地址

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