Improvements relating to telephone systems,申请号GB19290010226-传众专利搜索

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发明名称	Improvements relating to telephone systems
摘要
申请公布号	GB310029(A)	申请公布日期	1930.07.02
申请号	GB19290010226	申请日期	1929.04.02
申请人	CHARLES SAMUEL BLEICHER	发明人
分类号	H04L19/00;H04M1/65;H04M11/06	主分类号	H04L19/00
代理机构		代理人
主权项
地址

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