TY JOUR TI INCREASING THE TRACTIVE EFFORT OF FOREST WINCHES DURING LOADING AND UNLOADING OPERATIONS KW road train KW tractate effort KW forest winches KW loading and unloading operations KW friction clutches KW belt frictions. JO Voronezh Scientific-Technical Bulletin AU Jujukin, N.V. AU Kondratev, L.P. PY 2020 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov