Improvements relating to electro-magnetic units for acoustic instruments,申请号GB19300011360-传众专利搜索

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发明名称	Improvements relating to electro-magnetic units for acoustic instruments
摘要
申请公布号	GB336930(A)	申请公布日期	1930.10.23
申请号	GB19300011360	申请日期	1930.04.10
申请人	JOSEF RUPPERT	发明人
分类号	H04R11/00	主分类号	H04R11/00
代理机构		代理人
主权项
地址

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