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公开(公告)号：US3387937A
公开(公告)日：1968-06-11
申请号：US50885365
申请日：1965-11-19
Applicant: KNAPSACK AG
Inventor： HERMANN NIERMANN , HELMUTH KLEE , WILHELM FORST , JOSEPH CREMER
IPC: C01B25/00
CPC classification number: C01B25/00
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