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公开(公告)号：US2890624A
公开(公告)日：1959-06-16
申请号：US31348252
申请日：1952-10-07
Applicant: RCA CORP
Inventor： ELLEN WIDDOP MARY , LEVERENZ HUMBOLDT W
IPC: G02B5/28
CPC classification number: G02B5/285
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