PD KHLC, the supplier of materials, VNL, hires outsourcing equipment, transporting equipment to perform the transitional S&T task in 2022 "Researching, manufacturing, and perfecting the electrical system - automatic control of the local ventilation fan for service underground mining service" under the "National Key Science and Technology Program for the renewal and modernization of mining and mineral processing technologies by 2025" implementing the Project "Innovation and technological modernization in the mining industry". minerals to 2025" chaired and implemented by the Mine Electromechanical Research Center, University of Mining and Geology