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公开(公告)号：US2708250A
公开(公告)日：1955-05-10
申请号：US29182552
申请日：1952-06-05
Applicant: FARNSWORTH RES CORP
Inventor： DAY CYRIL L
CPC classification number: H01J31/501 , H01J5/20 , H01J29/02 , H01J2893/0037 , Y10T403/21
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