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发明名称
Elektrodynamisches Magnetsystem für Mikrophone, Lautsprecher und ähnliche Vorrichtungen.
摘要
申请公布号
AT115975(B)
申请公布日期
1930.01.25
申请号
ATD115975
申请日期
1928.03.05
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
ROELOF VERMEULEN;AREND THOMAS VAN URK
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主分类号
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