Improvements in or relating to automatic telephone exchange systems,申请号GB19490021044-传众专利搜索

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发明名称	Improvements in or relating to automatic telephone exchange systems
摘要
申请公布号	GB722172(A)	申请公布日期	1955.01.19
申请号	GB19490021044	申请日期	1949.08.12
申请人	HER MAJESTY'S POSTMASTER GENERAL	发明人	FLOWERS THOMAS HAROLD
分类号	H04Q3/42;H04Q11/04	主分类号	H04Q3/42
代理机构		代理人
主权项
地址

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