Perfectionnements aux dispositifs électro-acoustiques tels que des haut-parleurs,申请号FRD700644-传众专利搜索

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发明名称	Perfectionnements aux dispositifs électro-acoustiques tels que des haut-parleurs
摘要
申请公布号	FR700644(A)	申请公布日期	1931.03.05
申请号	FRD700644	申请日期	1930.08.14
申请人	ELECTRICAL RESEARCH PRODUCTS INC.	发明人
分类号	H04R7/00	主分类号	H04R7/00
代理机构		代理人
主权项
地址

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