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公开(公告)号：US1954191A
公开(公告)日：1934-04-10
申请号：US29643128
申请日：1928-07-31
Applicant: ALLG ELEK ZITATS GES
Inventor： WALTER AKEMANN
IPC: H01J21/20
CPC classification number: H01J21/20 , H01J2893/003
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