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经营范围
发明名称
Multiunit tube
摘要
申请公布号
US2219590(A)
申请公布日期
1940.10.29
申请号
US19370121507
申请日期
1937.01.21
申请人
FRACKER HENRY E
发明人
FRACKER HENRY E.
分类号
H01J21/20
主分类号
H01J21/20
代理机构
代理人
主权项
地址
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