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公开(公告)号：US2990492A
公开(公告)日：1961-06-27
申请号：US76938158
申请日：1958-10-24
Applicant: GEN ELECTRIC
Inventor： WELLINGER ROGER P , RODERICK JAMES E
CPC classification number: H01J17/00 , H01J2893/0059 , H01T4/12
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