Improvements in or relating to electrical signalling systems particularly telephone or like systems,申请号GB19510017678-传众专利搜索

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发明名称	Improvements in or relating to electrical signalling systems particularly telephone or like systems
摘要
申请公布号	GB717689(A)	申请公布日期	1954.11.03
申请号	GB19510017678	申请日期	1951.07.25
申请人	BRITISH TELECOMMUNICATIONS RESEARCH LIMITED	发明人	BAKER GEORGE THOMAS
分类号	H04Q3/42	主分类号	H04Q3/42
代理机构		代理人
主权项
地址

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