Improvements relating to telephone transmitters,申请号GB19300033612-传众专利搜索

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发明名称	Improvements relating to telephone transmitters
摘要
申请公布号	GB366955(A)	申请公布日期	1932.02.08
申请号	GB19300033612	申请日期	1930.11.08
申请人	SIEMENS BROTHERS & CO., LIMITED;WILLIAM ETHELBERT GOODWIN	发明人
分类号	H04R21/02	主分类号	H04R21/02
代理机构		代理人
主权项
地址

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