Système pour la transmission d'ondes sonores,申请号FRD689571-传众专利搜索

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发明名称	Système pour la transmission d'ondes sonores
摘要
申请公布号	FR689571(A)	申请公布日期	1930.09.09
申请号	FRD689571	申请日期	1930.02.07
申请人	LE MATERIEL TELEPHONIQUE	发明人
分类号	G10K11/04;H03H9/46	主分类号	G10K11/04
代理机构		代理人
主权项
地址

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