Perfectionnements aux systèmes de signalisation électriques,申请号FRD40772-传众专利搜索

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发明名称	Perfectionnements aux systèmes de signalisation électriques
摘要
申请公布号	FR40772(E)	申请公布日期	1932.08.23
申请号	FRD40772	申请日期	1931.04.16
申请人	ASSOCIATED TELEPHONE & TELEGRAPH COMPANY	发明人
分类号	H04L12/18	主分类号	H04L12/18
代理机构		代理人
主权项
地址

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