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公开(公告)号：US2721951A
公开(公告)日：1955-10-25
申请号：US20330650
申请日：1950-12-29
Applicant: RCA CORP
Inventor： MATTHEW COHEN ROBERT , JOHN PRAGER HANS
IPC: H01J21/20
CPC classification number: H01J21/20 , H01J2893/003
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