Improvements relating to the photographic recording of sound,申请号GB19290013717-传众专利搜索

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发明名称	Improvements relating to the photographic recording of sound
摘要
申请公布号	GB310933(A)	申请公布日期	1930.02.06
申请号	GB19290013717	申请日期	1929.05.02
申请人	ASSOCIATED ELECTRICAL INDUSTRIES LIMITED	发明人
分类号	G11B7/00	主分类号	G11B7/00
代理机构		代理人
主权项
地址

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