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公开(公告)号：US2654043A
公开(公告)日：1953-09-29
申请号：US1171448
申请日：1948-02-27
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： FREEMAN GEORGE A , ANDERSON JR CARL G
CPC classification number: H01J61/90 , H01J17/00 , H01J61/547 , H01J2893/0064
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