Certificate of conformity of welding processes with quality requirements according to standard PN-EN ISO 3834-2.

Certificate factory production control according to ZKP WG PN-EN 1090-1+A1 nr 1405-CPR-005 (IS)

Qualification certificate No. 10 / M17 of the Commission for the bridge structures in Warsaw, which entitles to the assembly and renovation of the bridge constructions according to standards valid in Poland