New or improved means for controlling the amplification and/or transmission and/or reproduction of sound by electricity,申请号GB19290029499-传众专利搜索

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发明名称	New or improved means for controlling the amplification and/or transmission and/or reproduction of sound by electricity
摘要
申请公布号	GB340048(A)	申请公布日期	1930.12.24
申请号	GB19290029499	申请日期	1929.09.30
申请人	LAURENCE HERBERT PEARSON;WILLIAM JOSEPH RANDALL	发明人
分类号	H03G1/02	主分类号	H03G1/02
代理机构		代理人
主权项
地址

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