Improvements relating to indicator devices,申请号GB19470003656-传众专利搜索

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发明名称	Improvements relating to indicator devices
摘要
申请公布号	GB620992(A)	申请公布日期	1949.04.01
申请号	GB19470003656	申请日期	1947.02.07
申请人	THE ENGLISH ELECTRIC COMPANY LIMITED	发明人
分类号	H04M3/08	主分类号	H04M3/08
代理机构		代理人
主权项
地址

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