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公开(公告)号：US3470489A
公开(公告)日：1969-09-30
申请号：US3470489D
申请日：1968-03-11
Applicant: NASA
Inventor： PAIK SUNGIK FRANCIS
CPC classification number: H01J17/005 , H03B29/00 , H03G3/005
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