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公开(公告)号：US2457004A
公开(公告)日：1948-12-21
申请号：US59529145
申请日：1945-05-23
Applicant: HAZELTINE RESEARCH INC
Inventor： CHRISTIAN STANNOW JORGEN
CPC classification number: H01J17/06 , H01J17/40 , H01J2893/0067
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