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经营范围
发明名称
Improvements in or relating to valve amplifiers
摘要
申请公布号
GB585419(A)
申请公布日期
1947.02.06
申请号
GB19440014973
申请日期
1944.08.04
申请人
DOUGLAS CRISP GALL
发明人
分类号
H03F17/00
主分类号
H03F17/00
代理机构
代理人
主权项
地址
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