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经营范围
发明名称
Improvements in or relating to vacuum tube amplifiers
摘要
申请公布号
GB633881(A)
申请公布日期
1949.12.30
申请号
GB19470012211
申请日期
1947.05.06
申请人
PHILCO CORPORATION
发明人
分类号
H03F3/36
主分类号
H03F3/36
代理机构
代理人
主权项
地址
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