Interlocking system for railroads,申请号US19300437472-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	US1824127(A)	申请公布日期	1931.09.22
申请号	US19300437472	申请日期	1930.03.20
申请人	GENERAL RAILWAY SIGNAL COMPANY	发明人	DODGSON FRANK L.
分类号	B61L7/08	主分类号	B61L7/08
代理机构		代理人
主权项
地址

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