Improvements in or relating to automatic or semi-automatic telephone systems,申请号GB19300037729-传众专利搜索

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发明名称	Improvements in or relating to automatic or semi-automatic telephone systems
摘要
申请公布号	GB363129(A)	申请公布日期	1931.12.17
申请号	GB19300037729	申请日期	1930.12.15
申请人	COVENTRY AUTOMATIC TELEPHONES LIMITED;JOHN EDWARD COLLYER	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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