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公开(公告)号：US3149996A
公开(公告)日：1964-09-22
申请号：US15217361
申请日：1961-11-14
Applicant: BASF AG
Inventor： HERBERT WAGNER , ERICH MERKEL
IPC: G11B5/702
CPC classification number: G11B5/7023 , Y10S428/90 , Y10T428/31797 , Y10T428/31928
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