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公开(公告)号：US3209143A
公开(公告)日：1965-09-28
申请号：US15044761
申请日：1961-11-06
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： HICKAM WILLIAM M , SWEENEY GEORGE G
IPC: H01J49/02
CPC classification number: H01J49/025
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