Improvements relating to the amplification and diffusion of sounds,申请号GB19280038564-传众专利搜索

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发明名称	Improvements relating to the amplification and diffusion of sounds
摘要
申请公布号	GB304313(A)	申请公布日期	1930.06.30
申请号	GB19280038564	申请日期	1928.12.31
申请人	ARMAND FERNAND EPHRAIEM	发明人
分类号	H04R1/34	主分类号	H04R1/34
代理机构		代理人
主权项
地址

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