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公开(公告)号：US2139757A
公开(公告)日：1938-12-13
申请号：US23106038
申请日：1938-09-21
Applicant: PHILIPS NV
Inventor： MINNE KUIPERS , GERARD BOUMEESTER HUIBERT
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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