Railway-traffic-controlling apparatus,申请号US19270231277-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	US1784851(A)	申请公布日期	1930.12.16
申请号	US19270231277	申请日期	1927.11.05
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	THOMPSON HOWARD A.
分类号	B61L29/28	主分类号	B61L29/28
代理机构		代理人
主权项
地址

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