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公开(公告)号：US2455602A
公开(公告)日：1948-12-07
申请号：US1032548
申请日：1948-02-24
Applicant: ACEC
Inventor： ROGER NEIRYNCK
IPC: H01J13/28
CPC classification number: H01J13/28 , H01J2893/0086
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