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经营范围
发明名称
Improvements in or relating to electron discharge tubes
摘要
申请公布号
GB633376(A)
申请公布日期
1949.12.12
申请号
GB19470011773
申请日期
1947.05.01
申请人
MARCONI'S WIRELESS TELEGRAPH COMPANY LIMITED
发明人
分类号
H01J19/36
主分类号
H01J19/36
代理机构
代理人
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