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公开(公告)号：US3157677A
公开(公告)日：1964-11-17
申请号：US2551560
申请日：1960-04-29
Applicant: BASF AG
Inventor： WALTER SEIBERT , FRITZ SCHUBERT , HANS OTTERBACH
IPC: C09B11/02
CPC classification number: C09B11/02
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