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公开(公告)号：US2180988A
公开(公告)日：1939-11-21
申请号：US14848837
申请日：1937-06-16
Applicant: GEN ELECTRIC
Inventor： EUGENE LEMMERS , CARPENTER GEORGE M
CPC classification number: H01J9/04 , H01J9/047 , H01J19/28 , H01J2893/0011
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