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公开(公告)号：US3294486A
公开(公告)日：1966-12-27
申请号：US39648364
申请日：1964-09-15
Applicant: KNAPSACK AG
Inventor： JOSEPH CREMER , HEINZ HARNISCH
IPC: C01B25/32
CPC classification number: C01B25/322
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