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发明名称
FREQUENCY-CHANGING ARRANGEMENTS
摘要
申请公布号
IE14956(L)
申请公布日期
1938.08.12
申请号
IED14956
申请日期
1938.02.14
申请人
N.V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H01J21/20;H01J43/02;H03D7/22;(IPC1-7):H03D7/22
主分类号
H01J21/20
代理机构
代理人
主权项
地址
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