Improvements in telephone exchange systems,申请号GB19470034847-传众专利搜索

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发明名称	Improvements in telephone exchange systems
摘要
申请公布号	GB655682(A)	申请公布日期	1951.08.01
申请号	GB19470034847	申请日期	1947.12.30
申请人	STAATSBEDRIJF DER POSTERIJEN TELEGRAFIE EN TELEFONIE	发明人
分类号	B06B1/16;H04Q3/00	主分类号	B06B1/16
代理机构		代理人
主权项
地址

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