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公开(公告)号：US3005252A
公开(公告)日：1961-10-24
申请号：US70540857
申请日：1957-12-26
Applicant: GEN ELECTRIC
Inventor： GOLDEN MARTIN P
IPC: H01J19/46
CPC classification number: H01J19/46 , H01J2893/0007
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