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公开(公告)号：US3281807A
公开(公告)日：1966-10-25
申请号：US26696263
申请日：1963-03-21
Applicant: BELL TELEPHONE LABOR INC
Inventor： AULT CYRUS F , GRANGER ROBERT H , MADDEN JAMES J
CPC classification number: G06K1/125 , G06K17/0009
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