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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
GB618362(A)
申请公布日期
1949.02.21
申请号
GB19460031794
申请日期
1946.10.25
申请人
SADIR-CARPENTIER
发明人
分类号
H01J19/50
主分类号
H01J19/50
代理机构
代理人
主权项
地址
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