| Classification of Products ver. 2002 (CZ-CPA) - level 5 - Class | 
                    4521 | 
                    General construction work for buildings and civil engineering work | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452131 | 
                    General construction work for long-distance pipelines for oil and gas | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452132 | 
                    General construction work for other long-distance pipelines, including for water | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452133 | 
                    General construction work for electricity power lines for railways | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452134 | 
                    General construction work for other electricity power lines, above ground | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452135 | 
                    General construction work for other electricity power lines, underground | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452136 | 
                    General construction work for communication lines, above ground | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452137 | 
                    General construction work for communication lines, underground |