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公开(公告)号:US3403291A
公开(公告)日:1968-09-24
申请号:US38302764
申请日:1964-07-16
Applicant: IBM
Inventor: LAZARCHICK JR NICHOLAS , THORPE ROBERT A
IPC: G01R13/26 , G09G1/00 , G09G1/10 , H01J29/52
CPC classification number: G01R13/26 , G09G1/002 , G09G1/10 , H01J29/52