Theoretical preconditions for determining the utilization coefficient of shift time when using planning machinesSobir Norov, Dilorom Zokirova, Nilufar Muzaffarova, Abdulla Ustaboev and Alloberdi MadraximovE3S Web of Conf., 390 (2023) 01031DOI: https://doi.org/10.1051/e3sconf/202339001031