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公开(公告)号：US2881343A
公开(公告)日：1959-04-07
申请号：US65320457
申请日：1957-04-16
Applicant: RCA CORP
Inventor： POLKOSKY JOSEPH J , SPLINTER AUGUST M
CPC classification number: H01J1/32 , H01J9/125 , H01J2201/32
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