FIELD: agricultural engineering. SUBSTANCE: unit has working tools made in the form of two conical spirals mounted on sections with rakes and connected for reversal relative to tractor. Rakes are offset backward as they approach to longitudinal axis of tractor for collecting and rapid transferring of material from one rake to another. Successive displacement of material by reversing rakes in conjunction with cutters allows width and efficiency to be increased. EFFECT: increased efficiency, improved safety of operation on slopes, reduced motion speed and passes, decreased power loss, reduced intensity, increased yield and improved soil fertility. 4 dwg
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