Improvements relating to telephone systems,申请号GB19370005830-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	GB482014(A)	申请公布日期	1938.03.22
申请号	GB19370005830	申请日期	1937.02.26
申请人	SIEMENS BROTHERS & CO. LIMITED;WILLIAM TYLER VOSPER	发明人
分类号	H04Q1/36	主分类号	H04Q1/36
代理机构		代理人
主权项
地址

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