TY JOUR TI On the modernization of drills for combined stumps KW drill KW stumps KW fixing cones. JO Actual directions of scientific researches of the XXI century: theory and practice AU Fedorov, O.. AU Rybalkin, D.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov