Improvements relating to telephone systems,申请号GB19340024883-传众专利搜索

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发明名称	Improvements relating to telephone systems
摘要
申请公布号	GB439318(A)	申请公布日期	1935.12.04
申请号	GB19340024883	申请日期	1934.08.29
申请人	SIEMENS BROTHERS & CO. LIMITED;BERNARD ANTHONY HENSLER;CHARLES LEONARD PETERS;WILLIAM HERBERT GRINSTED;DAVID ADAM CHRISTIAN	发明人
分类号	H04M3/523	主分类号	H04M3/523
代理机构		代理人
主权项
地址

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