FIELD: construction industry, system designed for mechanical connection of flooring boards. SUBSTANCE: stopping slot formed on lower side of first connection edge at some distance from connection plane is arranged perpendicular to connection plane and part protruding from lower part of second connection edge arranged beneath first connection edge are employed for connection of flooring boards. Protruding part holds stopping member interacting with stopping slot, the whole of this part is located outside of connection plane. Protruding part has at least two parts contacting along horizontal line which differ by composition of materials or properties of these materials. EFFECT: reduced cost of connection with preservation of strength and implemented function. 28 cl, 21 dwg
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