Railway signaling apparatus,申请号US19400343623-传众专利搜索

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发明名称	Railway signaling apparatus
摘要
申请公布号	US2272793(A)	申请公布日期	1942.02.10
申请号	US19400343623	申请日期	1940.07.02
申请人	THE UNION SWITCH AND SIGNAL COMPANY	发明人	DERR WILLIAM T.
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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