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1.发明授权
公开(公告)号：US3111604A
公开(公告)日：1963-11-19
申请号：US11470161
申请日：1961-06-05
Applicant: ERICSSON TELEFON AB L M
Inventor： BERTIL AGDUR NILS
CPC classification number: H01J25/34 , H01J25/005
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