Marcin Grzelak

42.21.Z - Works related to the construction of transmission pipelines and distribution networks

41.20.Z - Construction work related to the construction of residential and non-residential buildings

42.13.Z - Works related to the construction of bridges and tunnels

42.91.Z - Works related to the construction of water engineering objects

42.99.Z - Works related to the construction of other civil engineering and water engineering objects, not classified elsewhere

43.22.Z - Installation of plumbing, heating, and air-conditioning systems

43.29.Z - Specialized construction works