Improvements in or relating to telephone systems,申请号GB19460028521-传众专利搜索

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发明名称	Improvements in or relating to telephone systems
摘要
申请公布号	GB619073(A)	申请公布日期	1949.03.03
申请号	GB19460028521	申请日期	1946.09.24
申请人	AUTOMATIC ELECTRIC LABORATORIES INC.	发明人
分类号	H04M9/08	主分类号	H04M9/08
代理机构		代理人
主权项
地址

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