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发明名称
Cathode sleeve for thermionic valves
摘要
申请公布号
US2220909(A)
申请公布日期
1940.11.12
申请号
US19400315250
申请日期
1940.01.23
申请人
HENRY KERSHAW
发明人
KERSHAW HENRY
分类号
H01J1/22
主分类号
H01J1/22
代理机构
代理人
主权项
地址
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