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公开(公告)号：US3411882A
公开(公告)日：1968-11-19
申请号：US61676367
申请日：1967-02-17
Applicant: DEGUSSA
Inventor： HELMUT KNORRE , GERHARD KUHNER
IPC: C01B21/064
CPC classification number: C01B21/064 , C01P2006/10
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