Perfectionnements aux appareils pour l'enregistrement photographique du son,申请号FRD723435-传众专利搜索

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发明名称	Perfectionnements aux appareils pour l'enregistrement photographique du son
摘要
申请公布号	FR723435(A)	申请公布日期	1932.04.08
申请号	FRD723435	申请日期	1931.09.29
申请人	RADIO CORPORATION OF AMERICA	发明人
分类号	G11B3/00	主分类号	G11B3/00
代理机构		代理人
主权项
地址

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