Railway signaling system,申请号US19390250960-传众专利搜索

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发明名称	Railway signaling system
摘要
申请公布号	US2193906(A)	申请公布日期	1940.03.19
申请号	US19390250960	申请日期	1939.01.14
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	JR. JOHN W. LOGAN,
分类号	B61L19/14;B61L21/06	主分类号	B61L19/14
代理机构		代理人
主权项
地址

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