Improvements in alternating current transmission systems such as telephone systems incorporating echo suppressors,申请号GB19330006227-传众专利搜索

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发明名称	Improvements in alternating current transmission systems such as telephone systems incorporating echo suppressors
摘要
申请公布号	GB415767(A)	申请公布日期	1934.09.03
申请号	GB19330006227	申请日期	1933.03.01
申请人	LEONARD ERNEST RYALL	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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