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公开(公告)号：US3274610A
公开(公告)日：1966-09-20
申请号：US26695963
申请日：1963-03-21
Applicant: BELL TELEPHONE LABOR INC
Inventor： AULT CYRUS F , DAVID FRIEDMAN
IPC: G11B5/09
CPC classification number: G11B5/09
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