Perfectionnements aux systèmes électriques de signalisation,申请号FRD725607-传众专利搜索

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发明名称	Perfectionnements aux systèmes électriques de signalisation
摘要
申请公布号	FR725607(A)	申请公布日期	1932.05.14
申请号	FRD725607	申请日期	1931.09.08
申请人	LE MATERIEL TELEPHONIQUE	发明人
分类号	H04B3/38;H04J1/10	主分类号	H04B3/38
代理机构		代理人
主权项
地址

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