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公开(公告)号：US2675504A
公开(公告)日：1954-04-13
申请号：US15325950
申请日：1950-03-31
Applicant: IBM
Inventor： WALES JR NATHANIEL B
IPC: H01J17/48
CPC classification number: H01J17/48 , H01J2893/007
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公开(公告)号：US2573373A
公开(公告)日：1951-10-30
申请号：US9892849
申请日：1949-06-14
Applicant: IBM
Inventor： WALES JR NATHANIEL B
IPC: H01J17/48
CPC classification number: H01J17/48 , H01J2893/007
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公开(公告)号：US2687496A
公开(公告)日：1954-08-24
申请号：US10498049
申请日：1949-07-15
Applicant: IBM
Inventor： WALES JR NATHANIEL B
IPC: H01J17/48
CPC classification number: H01J17/48 , H01J2893/007
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