TY JOUR TI ROTARY REPLACEMENT OF SAW CHAINS AS A WAY TO INCREASE HARVESTER PRODUCTIVITY KW saw unit KW saw chains KW harvester KW logging KW performance JO Forestry Engineering Journal AU Savenkov, D.A. AU Savenkova, N.V. AU Derbin, M.V. AU Tret'yakov, A.V. PY 2020 IS 10 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov