Railway traffic controlling apparatus,申请号US19370134796-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	US2136808(A)	申请公布日期	1938.11.15
申请号	US19370134796	申请日期	1937.04.03
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	STAPLES CRAWFORD E.
分类号	B61L23/16	主分类号	B61L23/16
代理机构		代理人
主权项
地址

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