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公开(公告)号：US2960622A
公开(公告)日：1960-11-15
申请号：US72233158
申请日：1958-03-18
Applicant: INT STANDARD ELECTRIC CORP
Inventor： EDWARD BETTY CHARLES , ALFRED EVANS
IPC: H01J23/28
CPC classification number: H01J23/28
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