Improvements in and relating to electrically operated acoustic signalling apparatus,申请号GB19330019184-传众专利搜索

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发明名称	Improvements in and relating to electrically operated acoustic signalling apparatus
摘要
申请公布号	GB408480(A)	申请公布日期	1934.04.12
申请号	GB19330019184	申请日期	1933.07.06
申请人	N. V. MACHINERIEEN-EN APPARATEN FABRIEKEN	发明人
分类号	G08B3/10	主分类号	G08B3/10
代理机构		代理人
主权项
地址

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