Improvements in or for telephone and like systems,申请号GB19290039378-传众专利搜索

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发明名称	Improvements in or for telephone and like systems
摘要
申请公布号	GB345622(A)	申请公布日期	1931.03.24
申请号	GB19290039378	申请日期	1929.12.24
申请人	CHARLES EDWARD STEVENS	发明人
分类号	H04M3/08	主分类号	H04M3/08
代理机构		代理人
主权项
地址

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