Improvements relating to automatic telephone systems,申请号GB19450011442-传众专利搜索

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发明名称	Improvements relating to automatic telephone systems
摘要
申请公布号	GB592989(A)	申请公布日期	1947.10.06
申请号	GB19450011442	申请日期	1945.05.04
申请人	SIEMENS BROTHERS & CO. LIMITED;DOUGLAS PERCY LONG	发明人
分类号	H04Q3/42	主分类号	H04Q3/42
代理机构		代理人
主权项
地址

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