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公开(公告)号：US2749219A
公开(公告)日：1956-06-05
申请号：US40077053
申请日：1953-12-28
Applicant: STAMICARBON
Inventor： SIEDS KOOPAL , MOISON JOANNES H C
IPC: C01B32/942
CPC classification number: C01B32/942 , C01P2006/80
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