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公开(公告)号：US3490944A
公开(公告)日：1970-01-20
申请号：US3490944D
申请日：1966-09-09
Applicant: PHILIPS CORP
Inventor： ALMER FRIEDRICH HERMANN RAYMUN , KUIPER ADRIANUS , MAAN CORNELIS
CPC classification number: H01J1/22
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