Improvements in or relating to telecommunication systems,申请号GB19300003083-传众专利搜索

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发明名称	Improvements in or relating to telecommunication systems
摘要
申请公布号	GB347687(A)	申请公布日期	1931.04.29
申请号	GB19300003083	申请日期	1930.01.29
申请人	GEORGES VIARD	发明人
分类号	H04B3/20	主分类号	H04B3/20
代理机构		代理人
主权项
地址

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