Signaling system for railroads,申请号US19310508921-传众专利搜索

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发明名称	Signaling system for railroads
摘要
申请公布号	US2019462(A)	申请公布日期	1935.10.29
申请号	US19310508921	申请日期	1931.01.15
申请人	GENERAL RAILWAY SIGNAL COMPANY	发明人	PHINNEY ROBERT M.
分类号	B61L21/06	主分类号	B61L21/06
代理机构		代理人
主权项
地址

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