Sterilizers; Air purifiers; Air purifiers for automobiles; Air purifiers for household purposes; Air purifying apparatus; Air purifying apparatus and machines; Apparatus for disinfecting water; Germicidal lamps for purifying air; Industrial air purifiers; Ozone generators that kill mold and mildew; Sewage purification installations; Sterilizers for medical instruments; Tap-water purifying apparatus; Water purifying units, for potable water for domestic and commercial or industrial use; Water ...