Improvements in electric signalling and control systems,申请号GB19320032730-传众专利搜索

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发明名称	Improvements in electric signalling and control systems
摘要
申请公布号	GB398056(A)	申请公布日期	1933.09.07
申请号	GB19320032730	申请日期	1932.11.19
申请人	WILLIS HORABIN	发明人
分类号	E21F17/18	主分类号	E21F17/18
代理机构		代理人
主权项
地址

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