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发明名称
Improvements in or relating to magnet systems for loud-speakers
摘要
申请公布号
GB355919(A)
申请公布日期
1931.09.03
申请号
GB19300023424
申请日期
1930.08.05
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H04R11/00
主分类号
H04R11/00
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