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发明名称
Elektrische Entladungsröhre.
摘要
申请公布号
AT139256(B)
申请公布日期
1934.11.10
申请号
ATD139256
申请日期
1933.05.10
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
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主分类号
代理机构
代理人
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