Improvements in or relating to telephone systems,申请号GB19480005091-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	GB654092(A)	申请公布日期	1951.06.06
申请号	GB19480005091	申请日期	1948.02.20
申请人	WESTERN ELECTRIC COMPANY	发明人
分类号	H04Q3/00;H04Q3/42	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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