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公开(公告)号：US2699514A
公开(公告)日：1955-01-11
申请号：US25864451
申请日：1951-11-28
Applicant: DURO TEST CORP
Inventor： COX JAMES L , ARTHUR SHARKEY
IPC: H01J61/067
CPC classification number: H01J61/067
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