Improvements in or relating to telephone systems,申请号GB19380036570-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	GB522758(A)	申请公布日期	1940.06.26
申请号	GB19380036570	申请日期	1938.12.15
申请人	LEONARD ERNEST RYALL	发明人
分类号	H04M9/00	主分类号	H04M9/00
代理机构		代理人
主权项
地址

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