Improvements relating to telephone and like signalling systems,申请号GB19390027576-传众专利搜索

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发明名称	Improvements relating to telephone and like signalling systems
摘要
申请公布号	GB533113(A)	申请公布日期	1941.02.06
申请号	GB19390027576	申请日期	1939.10.10
申请人	SIEMENS BROTHERS & CO. LIMITED;DAVID LANGSFORD CLAY;CHARLES JOHN CLIFFORD BARTLETT;PERCY ALEXANDER CHITTENDEN	发明人
分类号	H04Q1/36	主分类号	H04Q1/36
代理机构		代理人
主权项
地址

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