Muñoz Pinto, Dirxon Javier, and Dirwin Alfonzo Munoz Pinto. “Preventive and Predictive Maintenance in Telephone Exchanges: Theoretical Review”. Athenea Engineering sciences journal 6, no. 22 (October 28, 2025): 18-27. Accessed November 8, 2025. https://athenea.autanabooks.com/index.php/revista/article/view/108.