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发明名称
Magnetsystem zur Umwandlung von elektrischen Schwingungen in akustische oder umgekehrt.
摘要
申请公布号
AT118150(B)
申请公布日期
1930.06.25
申请号
ATD118150
申请日期
1928.08.16
申请人
N. V. PHILIPS' GLOEILAMPENFABRIKEN
发明人
ING. ROELOF VERMEULEN;DR. AREND THOMAS VAN URK
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主分类号
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