Railway signaling system,申请号US19400369004-传众专利搜索

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发明名称	Railway signaling system
摘要
申请公布号	US2318542(A)	申请公布日期	1943.05.04
申请号	US19400369004	申请日期	1940.12.07
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	THOMPSON HOWARD A.
分类号	B61L23/16	主分类号	B61L23/16
代理机构		代理人
主权项
地址

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