Railway signaling apparatus,申请号US19400313117-传众专利搜索

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发明名称	Railway signaling apparatus
摘要
申请公布号	US2231520(A)	申请公布日期	1941.02.11
申请号	US19400313117	申请日期	1940.01.09
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	CRAGO PAUL H.
分类号	B61L7/06;B61L29/22	主分类号	B61L7/06
代理机构		代理人
主权项
地址

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