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公开(公告)号：US2216247A
公开(公告)日：1940-10-01
申请号：US33773040
申请日：1940-05-28
Applicant: GEN ELECTRIC
Inventor： WILY LEDIG , GEORG TREBBIN , HEINZ SEFFERT
CPC classification number: H01J5/54 , H01J5/20 , H01J5/24 , H01J2893/0037 , H01J2893/0039
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