Insulated railway crossing and frog,申请号US19300438331-传众专利搜索

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发明名称	Insulated railway crossing and frog
摘要
申请公布号	US1833063(A)	申请公布日期	1931.11.24
申请号	US19300438331	申请日期	1930.03.24
申请人	WARD BALKWILL STEPHEN	发明人	BALKWILL STEPHEN WARD
分类号	E01B7/28	主分类号	E01B7/28
代理机构		代理人
主权项
地址

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