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公开(公告)号：US3039016A
公开(公告)日：1962-06-12
申请号：US74541858
申请日：1958-06-30
Applicant: EMI LTD
Inventor： EXLEY THOMSON ERNEST , ALEXANDER GREEN DAVID , PETER HOLTON
CPC classification number: H01J43/10 , H01J19/28 , H01J29/023 , H01J2893/0013
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