Improvements in or relating to telephone systems,申请号GB19340004892-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	GB433381(A)	申请公布日期	1935.08.14
申请号	GB19340004892	申请日期	1934.02.14
申请人	ERICSSON TELEPHONES LIMITED;ALFRED BROOKES;RICHARD CHARLES WOODS	发明人
分类号	H04M1/74	主分类号	H04M1/74
代理机构		代理人
主权项
地址

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