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公开(公告)号：US2926255A
公开(公告)日：1960-02-23
申请号：US69165957
申请日：1957-10-22
Applicant: NAT RES DEV
Inventor： DENNIS GABOR , RAWSTHORNE STUART PETER
IPC: H01J31/12
CPC classification number: H01J31/124
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