Improvements in or relating to multiplex telephony systems,申请号GB19390011853-传众专利搜索

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发明名称	Improvements in or relating to multiplex telephony systems
摘要
申请公布号	GB525594(A)	申请公布日期	1940.08.30
申请号	GB19390011853	申请日期	1939.04.19
申请人	N. V. PHILIPS' GLOEILAMPENFABRIEKEN	发明人
分类号	H01J31/06;H04J3/04	主分类号	H01J31/06
代理机构		代理人
主权项
地址

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