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公开(公告)号：US3025427A
公开(公告)日：1962-03-13
申请号：US3099660
申请日：1960-05-23
Applicant: ERICSSON TELEPHONES LTD
Inventor： ALAN TURNER , ARTHUR REVITT WILLIAM
IPC: H01J17/48
CPC classification number: H01J17/48 , H01J2893/007
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