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公开(公告)号：US2468836A
公开(公告)日：1949-05-03
申请号：US63167845
申请日：1945-11-29
Applicant: ASEA AB
Inventor： PERSSON GUNNAR J
IPC: H01J1/00
CPC classification number: H01J1/00 , H01J2893/0051
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