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公开(公告)号：US3349274A
公开(公告)日：1967-10-24
申请号：US43516265
申请日：1965-02-25
Applicant: PHILIPS CORP
Inventor： DIRK KOLKMAN , DE VISSER ADOLF JAN
IPC: H01J61/54
CPC classification number: H01J61/545
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