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公开(公告)号：US2904710A
公开(公告)日：1959-09-15
申请号：US65385557
申请日：1957-04-19
Applicant: GEN ELECTRIC
Inventor： BEENINGA DALE E , MATZ WAYNE C
IPC: H01J61/34
CPC classification number: H01J61/34
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