Perfectionnements aux appareils acoustiques à membranes sonores,申请号FRD36441-传众专利搜索

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发明名称	Perfectionnements aux appareils acoustiques à membranes sonores
摘要
申请公布号	FR36441(E)	申请公布日期	1930.06.07
申请号	FRD36441	申请日期	1928.11.15
申请人	SOCIETE FRANCAISE RADIO-ELECTRIQUE	发明人
分类号	H04R7/18;H04R7/20	主分类号	H04R7/18
代理机构		代理人
主权项
地址

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