Perfectionnements aux dispositifs d'écoute radiophoniques placés dans les lieux publics, par exemple les voitures de chemin de fer,申请号FRD685606-传众专利搜索

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发明名称	Perfectionnements aux dispositifs d'écoute radiophoniques placés dans les lieux publics, par exemple les voitures de chemin de fer
摘要
申请公布号	FR685606(A)	申请公布日期	1930.07.12
申请号	FRD685606	申请日期	1929.11.26
申请人		发明人	TOUSSAINT ROBERT
分类号	H04H20/83	主分类号	H04H20/83
代理机构		代理人
主权项
地址

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