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公开(公告)号：US2455317A
公开(公告)日：1948-11-30
申请号：US60878645
申请日：1945-08-03
Applicant: NAT UNION RADIO CORP
Inventor： SCHNEIDER GERHARD G
CPC classification number: H01J5/32 , H01J5/24 , H01J2893/0039
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