Improvements relating to telephone systems,申请号GB19340032769-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	GB446917(A)	申请公布日期	1936.05.08
申请号	GB19340032769	申请日期	1934.11.14
申请人	SIEMENS BROTHERS & CO. LIMITED;WILLIAM GEORGE PATTERSON;REGINALD GRIFFITH DIXON	发明人
分类号	H04Q3/00	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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