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公开(公告)号：US2251062A
公开(公告)日：1941-07-29
申请号：US36319040
申请日：1940-10-28
Applicant: GEN ELECTRIC
Inventor： LEOPOLD LINDWURM , WOLFGANG THOURET
IPC: H01J5/32
CPC classification number: H01J5/32 , Y10T403/477
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