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公开(公告)号：US3067353A
公开(公告)日：1962-12-04
申请号：US6853160
申请日：1960-11-10
Applicant: PHILIPS CORP
Inventor： MARI FROUWS SIMON
IPC: H01J17/06
CPC classification number: H01J17/066 , H01J2893/0066
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