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发明名称
Vorrichtung zur Umwandlung elektrischer in akustische Schwingungen oder umgekehrt.
摘要
申请公布号
AT134903(B)
申请公布日期
1933.10.10
申请号
ATD134903
申请日期
1932.12.09
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
主分类号
代理机构
代理人
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