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公开(公告)号：US1929656A
公开(公告)日：1933-10-10
申请号：US44168330
申请日：1930-04-04
Applicant: WESTINGHOUSE ELECTRIC & MFG CO
Inventor： SHAND ERROL B
CPC classification number: H01J13/04 , H01J13/10 , H01J2893/0074
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