Improved arrangements relating to sound translation and amplification,申请号GB19390010599-传众专利搜索

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发明名称	Improved arrangements relating to sound translation and amplification
摘要
申请公布号	GB527249(A)	申请公布日期	1940.10.04
申请号	GB19390010599	申请日期	1939.04.05
申请人	ALFRED GRAHAM & CO., LIMITED;CYRIL HUGH VAUGHAN	发明人
分类号	H04R3/12	主分类号	H04R3/12
代理机构		代理人
主权项
地址

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