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发明名称
Improvements in audio-frequency thermionic amplifiers
摘要
申请公布号
GB509296(A)
申请公布日期
1939.07.13
申请号
GB19370027771
申请日期
1937.10.13
申请人
GERARD DE MONGE
发明人
分类号
H03G3/26
主分类号
H03G3/26
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代理人
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