[Class : 11] Gas Purification Apparatus; Gas Purification Machines; Gas Purification Installations; Filters For Waste Gas Purification; Scrubbing Columns For The Purification Of Gases; Scrubbing Towers For The Purification Of Gases; Apparatus For The Purification Of Liquids; Waste Water Treatment Installations; Waste Water Treatment Tanks; Cartridge Filtration Units [Water T...