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公开(公告)号：US2997590A
公开(公告)日：1961-08-22
申请号：US82324759
申请日：1959-06-26
Applicant: IBM
Inventor： LYONS VINCENT J , SILVEY GENE A , TURNER WILLIAM J
IPC: G02B5/20
CPC classification number: G02B5/207
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