Railway-crossover frog construction,申请号US19270242453-传众专利搜索

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发明名称	Railway-crossover frog construction
摘要
申请公布号	US1784211(A)	申请公布日期	1930.12.09
申请号	US19270242453	申请日期	1927.12.24
申请人	VISSAT ANTHONY L	发明人	VISSAT ANTHONY L.
分类号	E01B7/14	主分类号	E01B7/14
代理机构		代理人
主权项
地址

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