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发明名称
Magnetic focussing device
摘要
申请公布号
US2416687(A)
申请公布日期
1947.03.04
申请号
US19440528697
申请日期
1944.03.30
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
FRY EUGENE M.
分类号
H01J29/54
主分类号
H01J29/54
代理机构
代理人
主权项
地址
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