Perfectionnements aux systèmes téléphoniques,申请号FRD724352-传众专利搜索

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发明名称	Perfectionnements aux systèmes téléphoniques
摘要
申请公布号	FR724352(A)	申请公布日期	1932.04.26
申请号	FRD724352	申请日期	1931.09.08
申请人	ASSOCIATED TELEGRAPH & TELEPHONE COMPANY	发明人
分类号	H04Q3/00	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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