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公开(公告)号：US3114068A
公开(公告)日：1963-12-10
申请号：US7151060
申请日：1960-11-25
Applicant: SHORTRIDGE ROBERT A
Inventor： SHORTRIDGE ROBERT A
CPC classification number: H01J29/487 , H01J9/50 , H01J2893/0072 , Y02W30/828
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