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发明名称
Improvements in or relating to thermionic devices
摘要
申请公布号
GB309447(A)
申请公布日期
1930.07.09
申请号
GB19290010952
申请日期
1929.04.09
申请人
THE BRITISH THOMSON-HOUSTON COMPANY, LIMITED
发明人
分类号
H01J17/54
主分类号
H01J17/54
代理机构
代理人
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