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公开(公告)号：US3102764A
公开(公告)日：1963-09-03
申请号：US1561560
申请日：1960-03-17
Applicant: PHILIPS CORP
Inventor： REMKO HOVINGH ALBERTUS , REINIERUS PERDIJK HENDRIK JOHA
IPC: H01J7/18
CPC classification number: H01J7/18
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