Improvements in automatic telephone or telegraph exchange systems,申请号GB19470034971-传众专利搜索

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发明名称	Improvements in automatic telephone or telegraph exchange systems
摘要
申请公布号	GB655683(A)	申请公布日期	1951.08.01
申请号	GB19470034971	申请日期	1947.12.31
申请人	STAATSBEDRIJF DER POSTERIJEN TELEGRAFIE EN TELEFONIE	发明人	OBERMAN ROELOF MAARTEN MARIE
分类号	H04Q1/18;H04Q3/42	主分类号	H04Q1/18
代理机构		代理人
主权项
地址

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