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经营范围
发明名称
Improvements in or relating to thermionic valves and like electric discharge devices
摘要
申请公布号
GB495739(A)
申请公布日期
1938.11.18
申请号
GB19370032104
申请日期
1937.11.22
申请人
THE MI¬O VALVE COMPANY LIMITED;COLIN JAMES SMITHELLS
发明人
分类号
H01J19/48
主分类号
H01J19/48
代理机构
代理人
主权项
地址
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