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公开(公告)号：US3273965A
公开(公告)日：1966-09-20
申请号：US45026365
申请日：1965-04-20
Applicant: KNAPSACK AG
Inventor： FRIEDBERT RITTER , HILDEGARD RODIS , KONRAD REUTER , HUGO QUERENGASSER
IPC: C01B25/02 , C01B32/942 , C22B4/00
CPC classification number: C01B25/02 , C01B25/003 , C01B32/942 , C22B4/00
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