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1.发明授权
公开(公告)号：US2191820A
公开(公告)日：1940-02-27
申请号：US23807638
申请日：1938-10-31
Applicant: MONTEDISON SPA
Inventor： FILIPPO BERETTA
IPC: C07C303/22 , C07C309/40
CPC classification number: C07C303/22 , C07C309/40
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