FIELD: certification of wood in the tree, tree lengths, logs, bars, constructional members. SUBSTANCE: method involves providing standard samples by forming on trunk of tree assigned for felling or on part of it formed as log in different states in direction transverse to fibers at least two slots with wooden web between said slots. EFFECT: wider capabilities in testing and certifying of wood in different states and in articles. 5 cl, 5 dwg
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