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公开(公告)号：US2228985A
公开(公告)日：1941-01-14
申请号：US18099237
申请日：1937-12-21
Applicant: PETROLITE CORP
Inventor： DE GROOTE MELVIN , BERNHARD KEISER , BLAIR JR CHARLES MELVIN
CPC classification number: C07C305/06
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