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公开(公告)号：US3131359A
公开(公告)日：1964-04-28
申请号：US27580363
申请日：1963-04-23
Applicant: ZENITH RADIO CORP
Inventor： ROBERT ADLER , RYAN GEORGE H
IPC: H01J25/49
CPC classification number: H01J25/49
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