TY JOUR TI MOTION EQUATION OF TOOTH BLADE OF SPIRAL-PLATE WORKING UNIT IN SPACE KW spiral-plate working unit KW soil KW tooth blade KW circular helix. JO Vestnik of Kazan State Agrarian University AU Shiriyazdanov , R.. AU Pikmullin, G.V. AU Yunusov, R.. AU Bulgariev, G.G. PY 2016 IS 11 PB Kazan state agrarian University