Chlorine sterilizing apparatus for swimming pools; heat exchangers; bath-water sterilizing apparatus for industrial use, food sterilizing apparatus; water-purifying apparatus for hot springs or swimming pools; water-purifying apparatus for other purpose; electric bath-water purifying apparatus for household; evaporators; distillers; milk sterilizers; industrial furnaces; industrial boilers; freezing machines and apparatus; cloths dryers for industrial purposes; hair drying apparatus for beauty salon use; industrial dish dryers; dish disinfectant apparatus for industrial use; tap water faucets; level controlling plumbing valves for tanks; garbage incinerators; solar water heaters; water purifying apparatus; washers for water taps; kitchen sinks; ice chests; household tap-water filters; gas lamps; oil lamps; lamp chimneys; toilet stool units with a washing water squirter; disinfectant dispensers for toilets; toilet bowls; waste water treatment tanks for household purposes; septic tanks for household purposes