Improvements in and relating to telephone systems,申请号GB19300002673-传众专利搜索

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发明名称	Improvements in and relating to telephone systems
摘要
申请公布号	GB344606(A)	申请公布日期	1931.03.12
申请号	GB19300002673	申请日期	1930.01.25
申请人	SIEMENS BROTHERS & CO., LIMITED;ALFRED THOMAS CLOWSLEY MOORE;DAVID ADAM CHRISTIAN	发明人
分类号	H04Q1/446	主分类号	H04Q1/446
代理机构		代理人
主权项
地址

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