Railway crossing bar,申请号US19480008032-传众专利搜索

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发明名称	Railway crossing bar
摘要
申请公布号	US2574926(A)	申请公布日期	1951.11.13
申请号	US19480008032	申请日期	1948.02.13
申请人	MANLEY OWEN E	发明人	MANLEY OWEN E.
分类号	E01C9/04	主分类号	E01C9/04
代理机构		代理人
主权项
地址

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