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公开(公告)号：US2517981A
公开(公告)日：1950-08-08
申请号：US6925449
申请日：1949-01-05
Applicant: IBM
Inventor： CORSON BAYARD R
IPC: H01J19/38
CPC classification number: H01J19/38 , H01J2893/0015
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公开(公告)号：US2641728A
公开(公告)日：1953-06-09
申请号：US14633250
申请日：1950-02-25
Applicant: IBM
Inventor： CORSON BAYARD R , PLATTER A V
CPC classification number: H01J19/66
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