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经营范围
发明名称
Elektrische Entladungsröhre.
摘要
申请公布号
AT139590(B)
申请公布日期
1934.11.26
申请号
ATD139590
申请日期
1931.12.04
申请人
N. V. PHILIP'S GLOEILAMPENFABRIEKEN
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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