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2022. Estimation of the Optimum Period for the Replacement of Machines Using the Age Replacement Model Under the Minimum Cost Criterion. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ). 52, 2 (Dec. 2022), 1–10. DOI:https://doi.org/10.55562/jrucs.v52i1.537.