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公开(公告)号：US2769000A
公开(公告)日：1956-10-30
申请号：US27988452
申请日：1952-04-01
Applicant: MIJ VOOR KOLENBEIWERKING STAMI
Inventor： KREVELEN DIRK W VAN , DE GELDER ARTHUR L
IPC: C07D201/04
CPC classification number: C07D201/04
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