TY JOUR TI Theoretical substantiation of the parameters of the device to massage the udder of cows KW massage the udder KW device KW vacuum KW body work KW mechanical JO Actual directions of scientific researches of the XXI century: theory and practice AU Chekhunov, O.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov