Improvements relating to signalling means for use in telephone systems,申请号GB19450002703-传众专利搜索

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发明名称	Improvements relating to signalling means for use in telephone systems
摘要
申请公布号	GB599813(A)	申请公布日期	1948.03.22
申请号	GB19450002703	申请日期	1946.02.21
申请人	HERBERT SANG HUGHES	发明人
分类号	G08B27/00	主分类号	G08B27/00
代理机构		代理人
主权项
地址

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