%0 Journal Article %T The Mechanical Engineering as the System-Forming Branch of the Tula Region Economy %A Lomovcev, D.A. %A Lomovcev, P.D. %A Bobkov, A.S. %K mechanical engineering, gross value added, machines and equipment, regional economy, Tula region %J Scientific Research and Development. Economics %D 2026 %N 14 %P 4 %I INFRA-M Academic Publishing LLC.