TY JOUR TI INCREASING THE TECHNICAL LEVEL OF HYDRAULIC MANIPULATORS OF AUTOCOLLIMATIONAL KW hydraulic manipulator KW damper KW hydraulic actuator KW boom KW rotary column JO Actual directions of scientific researches of the XXI century: theory and practice AU Popikov, P.I. AU Chetverikova, I.V. AU Chernykh, A.S. PY 2020 IS 8 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov