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公开(公告)号：US2175695A
公开(公告)日：1939-10-10
申请号：US24316138
申请日：1938-11-30
Applicant: GEN ELECTRIC
Inventor： PETER KNIEPEN
CPC classification number: H01J7/183 , H01J19/00 , H01J2893/0023
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