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公开(公告)号：US3505553A
公开(公告)日：1970-04-07
申请号：US3505553D
申请日：1967-04-27
Applicant: PHILIPS CORP
Inventor： PIREE PIERRE THEODOOR JOHAN
IPC: H01J61/067 , H01J1/14 , H01J17/04
CPC classification number: H01J61/0677
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