FIELD: forest taxation and forest management. SUBSTANCE: drill also relates to engineering ecology of forest ecological systems and to standing wood certification. Front tapered surface of drill has recesses inclined towards drill axis. Recesses are inclined in direction opposite to that of drill rotation. Walls of every recess according to direction of drill rotation are inclined in larger degree than opposite wall. This makes it possible to reduce damage to wood. EFFECT: simplified construction of cutting part. 4 dwg
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