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Denain-Anzin (Société des hauts-fourneaux, forges et aciéries de Denain et d'Anzin) was a steel manufacturer located in Denain and Anzin in the Nord department of France. The company was created through the merger of two smaller forges to produce rails for the Nord railway company. After World War II it was merged with other companies in 1948 to form Usinor.
See Wikipedia entry for Denain-Anzin.