Railway traffic controlling apparatus,申请号US19300453364-传众专利搜索

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发明名称	Railway traffic controlling apparatus
摘要
申请公布号	US1808325(A)	申请公布日期	1931.06.02
申请号	US19300453364	申请日期	1930.05.17
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	SPRAY LESTER 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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