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公开(公告)号：US2534077A
公开(公告)日：1950-12-12
申请号：US73623347
申请日：1947-03-21
Applicant: RECONSTRUCTION FINANCE CORP
Inventor： STEVENS CHARLES R
IPC: H01J21/20
CPC classification number: H01J21/20 , H01J2893/003
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