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公开(公告)号：US3547684A
公开(公告)日：1970-12-15
申请号：US3547684D
申请日：1968-10-17
Applicant: DOW CHEMICAL CO
Inventor： HOLLIS OSCAR LE ROY , ACUFF ROBERT D
CPC classification number: G01N30/482 , B01J2220/54
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