Improvements in alternating current signalling systems, particularly multi-channel carrier telegraph systems,申请号GB19310023871-传众专利搜索

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发明名称	Improvements in alternating current signalling systems, particularly multi-channel carrier telegraph systems
摘要
申请公布号	GB388424(A)	申请公布日期	1933.02.27
申请号	GB19310023871	申请日期	1931.08.25
申请人	LEONARD ERNEST RYALL	发明人
分类号	H04L5/06	主分类号	H04L5/06
代理机构		代理人
主权项
地址

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