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公开(公告)号：US3250857A
公开(公告)日：1966-05-10
申请号：US14823461
申请日：1961-10-27
Applicant: ZENITH RADIO CORP
Inventor： DE VRIES ADRIAN J , FLAMING DIAS
IPC: H03D1/22
CPC classification number: H03D1/2218
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