Automatic controller, namely, electrical controlling devices; Apparatus for testing liquids; Ionization apparatus for scientific or laboratory use, not for the treatment of air or water; Gas flow meters; Apparatus for testing suspended solids in water; Apparatus for analyzing water quality, namely, electronic-based instruments for measuring water quality, not for medical use; Gas detectors for detecting the presence of gas

Electric negative ion fans; Ozone cooling towers for air conditioning, namely, air conditioning apparatus; Water filters for producing potable water for domestic use; Drinking fountains; Household air cleaners; Ionization apparatus for the treatment of air or water; Ozone sanitizers for air; Ozone generators that kill mold and mildew for air; Ozone generators for air purification that kill mold and mildew; Waste water treatment apparatus for household purposes, namely, waste water purification units; Sewage disposal apparatus for household purposes, namely, waste disposal incinerators; Sewage purification apparatus; Apparatus for waste water treatment for household purposes, namely, waste water purification units; Filters for waste gas purification, namely, filters for gas conditioning; Apparatus for waste water purification; Ozone generators that kill mold and mildew for water; Filters for use in aquariums; Water sterilizers; ozone generators, namely, ozone generators that kill mold and mildew; anion generating humidifiers