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公开(公告)号：US2917671A
公开(公告)日：1959-12-15
申请号：US54009555
申请日：1955-10-12
Applicant: PHILIPS CORP
Inventor： HELLMUTH HERTZ
CPC classification number: H01J17/44 , H01J3/025 , H01J17/30 , H01J2893/0061
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