Perfectionnements aux dispositifs acoustiques,申请号FRD768373-传众专利搜索

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发明名称	Perfectionnements aux dispositifs acoustiques
摘要
申请公布号	FR768373(A)	申请公布日期	1934.08.04
申请号	FRD768373	申请日期	1933.04.26
申请人		发明人	D'ALTON ANDRE
分类号	H04R1/28	主分类号	H04R1/28
代理机构		代理人
主权项
地址

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