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公开(公告)号：US2221952A
公开(公告)日：1940-11-19
申请号：US18402238
申请日：1938-01-08
Applicant: STANDARD IG CO
Inventor： MATHIAS PIER , WILHELM URBAN , ERNST DONATH
CPC classification number: C10G1/004 , C10G49/005
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