Improvements in or relating to electric signalling systems,申请号GB19420013169-传众专利搜索

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发明名称	Improvements in or relating to electric signalling systems
摘要
申请公布号	GB557027(A)	申请公布日期	1943.11.02
申请号	GB19420013169	申请日期	1942.09.18
申请人	STANDARD TELEPHONES AND CABLES LIMITED	发明人
分类号	H04Q1/453	主分类号	H04Q1/453
代理机构		代理人
主权项
地址

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