Perfectionnements aux dispositifs d'aide acoustique,申请号FRD934924-传众专利搜索

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发明名称	Perfectionnements aux dispositifs d'aide acoustique
摘要
申请公布号	FR934924(A)	申请公布日期	1948.06.04
申请号	FRD934924	申请日期	1946.10.17
申请人	PARAPHONE HEARING AID, INC.	发明人
分类号	H04R25/04	主分类号	H04R25/04
代理机构		代理人
主权项
地址

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