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发明名称
Verfahren zur Umwandlung der Frequenz elektrischer Schwingungen
摘要
申请公布号
DE520389(C)
申请公布日期
1931.03.11
申请号
DE1929N031092D
申请日期
1929.10.30
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
POL DR. BALTHASAR VAN DER;MARK JAN VAN DER
分类号
H01J13/48;H03B19/16
主分类号
H01J13/48
代理机构
代理人
主权项
地址
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