Improvements relating to telephone systems,申请号GB19550008009-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	GB827174(A)	申请公布日期	1960.02.03
申请号	GB19550008009	申请日期	1955.03.18
申请人	SIEMENS EDISON SWAN LIMITED	发明人	STALLWORTHY FRANK ALLEN;BROWN JOHN GRAHAM
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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