[Class : 11] Waste Water Treatment Plants, Industrial Waste Water Treatment Facilities, Installations And Apparatus For The Treatment And Upgrading Of Polluted Natural Water And Drinking Water, Including The Treatment Of Water/Waters Used For Fish Farming And Fish Breeding; Equipment For Steering Gas Flows, Regulating Apparatus For Gas Flows And Injectors For Introducing Air Or Oxygen Or Mixtures Thereof Into Waste Water, Polluted Natural Water Or Drinking Water, And Also Into Rivers, Lakes And Waters For Fish Farming; Installations And Installation Systems For Treatment Of Industrial Waste Water And Sewage Water In General, Namely A Combination Of An Oxygen Storage And Supply Apparatus And Gas Injection Devices For The Oxygenation Of Such Waters; Aerators For The Oxygenation Of Water Bodies; Gas Distributors And Gas Injectors, In Particular Nozzle And Venturi Based Injectors, For Introducing Oxygen Or Oxygen Air Mixtures Into Water Bodies Or Water Flows.