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发明名称
Dispositif pour la transformation d'oscillations électriques en vibrations acoustiques ou inversement
摘要
申请公布号
FR708294(A)
申请公布日期
1931.07.22
申请号
FRD708294
申请日期
1930.12.23
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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