Lvovich, S.R. and Evgenievich, Z.E. 2023. Development of Technology and Equipment for Non-destructive Testing of Defects in Sewing Mandrels of a Three-roll Screw Mill 30-80. Journal of Electronic & Information Systems. 5, 2 (Dec. 2023), 61–66. DOI:https://doi.org/10.30564/jeis.v5i2.6000.