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经营范围
发明名称
Improvements in or relating to audio frequency thermionic amplifiers
摘要
申请公布号
GB504960(A)
申请公布日期
1939.05.03
申请号
GB19380000965
申请日期
1938.01.12
申请人
FERRANTI LIMITED;NORMAN HALIFAX SEARBY;GRAHAM ISAAC THOMAS
发明人
分类号
H03F3/28;H03F3/32
主分类号
H03F3/28
代理机构
代理人
主权项
地址
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