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公开(公告)号：US2882587A
公开(公告)日：1959-04-21
申请号：US62745356
申请日：1956-12-10
Applicant: RAYTHEON MFG CO
Inventor： MCCOWAN UNGER ROBERT , ROBERT HARPER
IPC: H01J23/28
CPC classification number: H01J23/28 , Y10T29/49016
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