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公开(公告)号：US2731464A
公开(公告)日：1956-01-17
申请号：US30790252
申请日：1952-09-04
Applicant: BASF AG
Inventor： FRIEDRICH EBEL , WALTER RUPP , WALTER KELLER
IPC: C09B1/36
CPC classification number: C09B1/36
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