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公开(公告)号：US2674595A
公开(公告)日：1954-04-06
申请号：US11920649
申请日：1949-10-01
Applicant: BASF AG
Inventor： HELMUT PFITZNER , HELMUT MERKEL
IPC: C09B45/01
CPC classification number: C09B45/01
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