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公开(公告)号：CH493902A
公开(公告)日：1970-07-15
申请号：CH1269768
申请日：1968-08-23
Applicant: BASF AG
Inventor： SCHNELL GEORG DR , HARTMANN JOB-WERNER DR , KOEHNLEIN ERNST DR , FRITZ HAMMEN
IPC: G03B21/32 , G11B23/037 , G11B25/06
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