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公开(公告)号：US2678346A
公开(公告)日：1954-05-11
申请号：US12673549
申请日：1949-11-12
Applicant: ITT
Inventor： GARRAWAY RICHARD E
IPC: H01J5/30
CPC classification number: H01J5/30 , H01J2893/0046
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