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公开(公告)号：US2757306A
公开(公告)日：1956-07-31
申请号：US49010455
申请日：1955-02-23
Applicant: NAT RES DEV
Inventor： THURBURN CONN GEORGE KEITH , NEVILLE DAGLISH HUGH
IPC: H01J41/06
CPC classification number: H01J41/06
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