Improvements in or relating to electrical signalling systems,申请号GB19400016541-传众专利搜索

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发明名称	Improvements in or relating to electrical signalling systems
摘要
申请公布号	GB545260(A)	申请公布日期	1942.05.18
申请号	GB19400016541	申请日期	1940.11.15
申请人	STANDARD TELEPHONES AND CABLES LIMITED;WILLIAM ARNOLD BEATTY	发明人
分类号	H04J3/00;H04L5/00	主分类号	H04J3/00
代理机构		代理人
主权项
地址

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