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1.发明授权
公开(公告)号：US3227689A
公开(公告)日：1966-01-04
申请号：US16959562
申请日：1962-01-29
Applicant: STAMICARBON
Inventor： ASSELT WILLEM J VAN , EVERS JOHANNES J M , GIELEN MARIA H
IPC: C08G2/00
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