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公开(公告)号：US2761086A
公开(公告)日：1956-08-28
申请号：US30708252
申请日：1952-08-29
Applicant: GEN ELECTRIC
Inventor： NOEL EDWARD B , FALCONER JR JOHN I
CPC classification number: H01J61/20 , H01J61/822
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