Improvements in or relating to electrical signalling systems,申请号GB19390009737-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	GB527035(A)	申请公布日期	1940.10.01
申请号	GB19390009737	申请日期	1939.03.28
申请人	ASSOCIATED ELECTRIC LABORATORIES INC.	发明人
分类号	H04B3/54;H04J1/14;H04M7/16	主分类号	H04B3/54
代理机构		代理人
主权项
地址

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