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21.发明授权
公开(公告)号：US2796426A
公开(公告)日：1957-06-18
申请号：US45860854
申请日：1954-09-27
Applicant: MONTEDISON SPA
Inventor： GERLANDO MARULLO , MARCO AGAMENNONE
CPC classification number: C07C253/12 , C07C255/08
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