Perfectionnements aux appareils reproducteurs ou récepteurs de sons,申请号FRD764457-传众专利搜索

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发明名称	Perfectionnements aux appareils reproducteurs ou récepteurs de sons
摘要
申请公布号	FR764457(A)	申请公布日期	1934.05.22
申请号	FRD764457	申请日期	1933.11.28
申请人		发明人	CARLING FRANCIS ROCK
分类号	H04R9/02	主分类号	H04R9/02
代理机构		代理人
主权项
地址

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