https://alpina-market.ru/catalog/?q=betonica 
The chair-chair BETONICA is compact and neat, the back and seat are smooth and rounded, and the armrests have an original shape. The frame is made by the most famous and most reliable method of carpentry - tenon jointing, which requires high precision in the preparation of parts, achieved on a high-precision laser machine, then the cut parts, like an ideal designer, are connected into a single monolithic structure. The legs of the chair are made of solid wood and are securely screwed into the frame.