Purification installations for sewage; Air purification units; Air purifiers; Air purifiers; Air purifying apparatus; Air purifying apparatus and machines; Flow restrictors for reverse osmosis water purification units; Gas purification machines; Germicidal lamps for purifying air; Industrial air purifiers; Industrial-water purifying apparatus; Machine that generates purified water from the atmosphere and simultaneously purifies the air; Oil purifying installations; Rainwater purification inst...