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2025. Article, Influence of Copper Electrode Material on Surface Quality in EDM Drilling of Heat-Treated C45 Steel: Surface Quality in EDM Drilling of Heat-Treated C45 Steel. Journal of Nanomaterials and Applications (JNA). 1, 1 (Nov. 2025), 33–42. DOI:https://doi.org/10.65273/hhit.jna.2025.1.1.33-42.