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公开(公告)号：US3428197A
公开(公告)日：1969-02-18
申请号：US3428197D
申请日：1966-04-13
Applicant: IBM
Inventor： FISCHER CHRISTOPHER L , HAUGHTON KENNETH E
CPC classification number: H01J29/865 , H01J5/30 , H01J2893/0045
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