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发明名称
Elektrische Entladungsröhre.
摘要
申请公布号
AT115885(B)
申请公布日期
1930.01.25
申请号
ATD115885
申请日期
1929.02.08
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
DR. GUSTAV ZECHER
分类号
主分类号
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