Improvements relating to automatic telephone systems,申请号GB19390023560-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	GB532896(A)	申请公布日期	1941.02.03
申请号	GB19390023560	申请日期	1939.08.15
申请人	SIEMENS BROTHERS & CO., LIMITED;DOUGLAS PERCY LONG;ERIC WESTALL DURKIN;CHARLES LEONARD PETERS	发明人
分类号	H04Q3/58	主分类号	H04Q3/58
代理机构		代理人
主权项
地址

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