Improvements in means for converting electrical energy into sound,申请号GB19340029654-传众专利搜索

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发明名称	Improvements in means for converting electrical energy into sound
摘要
申请公布号	GB447749(A)	申请公布日期	1936.05.18
申请号	GB19340029654	申请日期	1934.10.17
申请人	PAUL GUSTAVUS ADOLPHUS HELMUTH VOIGT	发明人
分类号	H04R1/28	主分类号	H04R1/28
代理机构		代理人
主权项
地址

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