Perfectionnements aux dispositifs traducteurs de sons,申请号FRD722108-传众专利搜索

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发明名称	Perfectionnements aux dispositifs traducteurs de sons
摘要
申请公布号	FR722108(A)	申请公布日期	1932.03.11
申请号	FRD722108	申请日期	1931.08.14
申请人	ELECTRICAL RESEARCH PRODUCTS INC.	发明人
分类号	H04R1/22;H04R1/28	主分类号	H04R1/22
代理机构		代理人
主权项
地址

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