Reduction of echo effects in electric signalling systems,申请号GB19290031260-传众专利搜索

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发明名称	Reduction of echo effects in electric signalling systems
摘要
申请公布号	GB340650(A)	申请公布日期	1931.01.08
申请号	GB19290031260	申请日期	1929.10.15
申请人	HORACE GILBERT DAVIS;HAROLD VICTOR CLARK	发明人
分类号	H04B3/20	主分类号	H04B3/20
代理机构		代理人
主权项
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