Railway switch box,申请号US19490116890-传众专利搜索

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发明名称	Railway switch box
摘要
申请公布号	US2647710(A)	申请公布日期	1953.08.04
申请号	US19490116890	申请日期	1949.09.21
申请人	HUMPHREY EUGENE O	发明人	HUMPHREY EUGENE O.
分类号	B61L5/02	主分类号	B61L5/02
代理机构		代理人
主权项
地址

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