Improvements in or relating to public address and like systems,申请号GB19290015317-传众专利搜索

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发明名称	Improvements in or relating to public address and like systems
摘要
申请公布号	GB333311(A)	申请公布日期	1930.08.14
申请号	GB19290015317	申请日期	1929.05.16
申请人	GRAHAM AMPLION LIMITED;ERNEST NORMAN ELFORD	发明人
分类号	H04M9/00	主分类号	H04M9/00
代理机构		代理人
主权项
地址

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