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公开(公告)号：US2222955A
公开(公告)日：1940-11-26
申请号：US14862637
申请日：1937-06-17
Applicant: ALLEGEMEINE ELEK CITATZ GES
Inventor： RICHARD ORTHUBER , EBERHARD STEUDEL , HANS MAHL
IPC: H01J29/60
CPC classification number: H01J29/60
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