Improvements relating to telephone instruments,申请号GB19300013163-传众专利搜索

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发明名称	Improvements relating to telephone instruments
摘要
申请公布号	GB349259(A)	申请公布日期	1931.05.28
申请号	GB19300013163	申请日期	1930.04.29
申请人	SIEMENS BROTHERS & CO., LIMITED;WILLIAM ETHELBERT GOODWIN	发明人
分类号	H04M1/08	主分类号	H04M1/08
代理机构		代理人
主权项
地址

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