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公开(公告)号：US2846610A
公开(公告)日：1958-08-05
申请号：US62698856
申请日：1956-12-07
Applicant: IBM
Inventor： DASS WILLIAM H , KOEHLER ROBERT B
CPC classification number: H01J17/40 , H01J17/44 , H01J2893/0067
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