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公开(公告)号：US2776885A
公开(公告)日：1957-01-08
申请号：US40213454
申请日：1954-01-04
Applicant: STAMICARBON
Inventor： SIEDS KOOPAL , SMIT PIERRE L , LOON WILLEM VAN
IPC: C22C33/00
CPC classification number: C22C33/003
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