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公开(公告)号：US3067911A
公开(公告)日：1962-12-11
申请号：US70537857
申请日：1957-12-26
Applicant: GEN ELECTRIC
Inventor： FINLEY EDWIN D , PENNOYER ROBERT T
IPC: H01J9/46
CPC classification number: H01J9/46 , H01J2893/0096
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