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公开(公告)号：US2225712A
公开(公告)日：1940-12-24
申请号：US70259633
申请日：1933-12-15
Applicant: GEN ELECTRIC
Inventor： PRICE THOMAS W
CPC classification number: G09F13/26 , C09K11/025 , H01J61/42 , H01J63/00 , H01J2893/0031
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