| 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 | 
                    452141 | 
                    General construction work for local water and sewage pipelines, including ancillary works | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452142 | 
                    General construction work for local power pipelines other than electricity, including ancillary works | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452143 | 
                    General construction work for local electricity power lines (including ancillary works), above ground | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452144 | 
                    General construction work for local electricity power lines (including ancillary works), underground | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452145 | 
                    General construction work for local telephone and other communication lines (including ancillary works), above ground | 
                  
                
                  
                    | Classification of Products ver. 2002 (CZ-CPA) - level 7 - Sub-category | 
                    452146 | 
                    General construction work for local telephone and other communication lines (including ancillary works), underground |