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公开(公告)号：US3502284A
公开(公告)日：1970-03-24
申请号：US3502284D
申请日：1967-07-10
Applicant: BASF AG
Inventor： LOEWENBERG GUSTAV , DIEBOLD ADOLF
IPC: G11B23/087 , G11B23/04
CPC classification number: G11B23/08764 , Y10S242/90
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