Improvements in and relating to automatic and semi-automatic telephone systems,申请号GB19290005747-传众专利搜索

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发明名称	Improvements in and relating to automatic and semi-automatic telephone systems
摘要
申请公布号	GB325392(A)	申请公布日期	1930.02.20
申请号	GB19290005747	申请日期	1929.02.21
申请人	STANDARD TELEPHONES AND CABLES, LIMITED;JOHN HENRY ELVIDGE BAKER	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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