Interlocking system for railroads,申请号US19300479668-传众专利搜索

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发明名称	Interlocking system for railroads
摘要
申请公布号	US1889708(A)	申请公布日期	1932.11.29
申请号	US19300479668	申请日期	1930.09.04
申请人	GENERAL RAILWAY SIGNAL COMPANY	发明人	STEPHENSON JAMES E.
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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