Railway track circuit apparatus,申请号US19340738988-传众专利搜索

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发明名称	Railway track circuit apparatus
摘要
申请公布号	US2061747(A)	申请公布日期	1936.11.24
申请号	US19340738988	申请日期	1934.08.08
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	WITMER HAROLD G.;HEDDING LINNIE K.
分类号	B61L1/18	主分类号	B61L1/18
代理机构		代理人
主权项
地址

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