Improvements in or relating to telephone systems,申请号GB19290037695-传众专利搜索

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发明名称	Improvements in or relating to telephone systems
摘要
申请公布号	GB339493(A)	申请公布日期	1930.12.11
申请号	GB19290037695	申请日期	1929.12.09
申请人	COVENTRY AUTOMATIC TELEPHONES LIMITED;BENJAMIN FRANCIS MOSS	发明人
分类号	H04Q3/62	主分类号	H04Q3/62
代理机构		代理人
主权项
地址

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