Dk 021:2015 Code 50530000-9 Equipment Repair And Maintenance Services (Services For Maintenance And Repair Of Vacuum Switches Of The 6.3 Kv And 10.5 Kv Substation Switchgear Of The Kyiv Hpp Branch Of "Cascade Of Kyiv Hpps And Hpps" Pjsc "Ukrhydroenergo")