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经营范围
发明名称
Improvements in and relating to amplifying thermionic tubes or valves
摘要
申请公布号
GB397254(A)
申请公布日期
1933.08.24
申请号
GB19320013132
申请日期
1932.05.06
申请人
MAX ALBIN ERNST PRESSLER
发明人
分类号
H01J40/00
主分类号
H01J40/00
代理机构
代理人
主权项
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