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公开(公告)号：US2476961A
公开(公告)日：1949-07-26
申请号：US73272447
申请日：1947-03-06
Applicant: PHILIPS NV
Inventor： GESINUS DIEMER
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/001
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