Dumanchuk, M.Y., Ivchenko, O.V., Zhyhylii, D., Zavhorodnii, D.M. and Kozin, V.M. 2025. INFLUENCE OF THE ADDENDUM MODIFICATION ON SPUR GEAR TRANSMISSION EFFICIENCY. Bulletin of Sumy National Agrarian University. The series: Mechanization and Automation of Production Processes. 4 (58) (Feb. 2025), 34-43. DOI:https://doi.org/10.32782/msnau.2024.4.5.