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公开(公告)号：US3221201A
公开(公告)日：1965-11-30
申请号：US23868062
申请日：1962-11-19
Applicant: RCA CORP
Inventor： JOSEPH FREE JEROME , GAYLORD JOHN W
IPC: H01J7/18
CPC classification number: H01J7/186
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