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公开(公告)号：US2925531A
公开(公告)日：1960-02-16
申请号：US75020258
申请日：1958-07-22
Applicant: PHILIPS CORP
Inventor： JAMES HART MICHAEL
IPC: H01J17/48
CPC classification number: H01J17/48 , H01J2893/007
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