Improvements in or relating to the ferro-magnetic systems of devices for converting electric oscillations into acoustic vibrations or conversely,申请号GB19300024600-传众专利搜索

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发明名称	Improvements in or relating to the ferro-magnetic systems of devices for converting electric oscillations into acoustic vibrations or conversely
摘要
申请公布号	GB351805(A)	申请公布日期	1931.07.02
申请号	GB19300024600	申请日期	1930.08.16
申请人	N. V. PHILIPS' GLOEILAMPENFABRIEKEN	发明人
分类号	H04R11/08	主分类号	H04R11/08
代理机构		代理人
主权项
地址

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