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公开(公告)号：US1893380A
公开(公告)日：1933-01-03
申请号：US49253930
申请日：1930-10-31
Applicant: GEN ELECTRIC
Inventor： USCHMAN CARL W , HARTMAN HOWARD W
IPC: H01J5/28
CPC classification number: H01J5/28 , H01J2893/0044
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