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公开(公告)号：US2396977A
公开(公告)日：1946-03-19
申请号：US45886742
申请日：1942-09-18
Applicant: RCA CORP
Inventor： GIDEON WLDELL EMIL
CPC classification number: C22C19/00 , H01J19/30 , H01J2893/002
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