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经营范围
发明名称
Improvements in and relating to electric attenuating circuits
摘要
申请公布号
GB526499(A)
申请公布日期
1940.09.19
申请号
GB19390008625
申请日期
1939.03.17
申请人
CHARLES JAMES WILLIAM HILL
发明人
分类号
H03H7/24
主分类号
H03H7/24
代理机构
代理人
主权项
地址
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