Water heaters, hot water heaters, hot-air heating apparatus, steam heaters, gas boilers, gas stoves, boilers for household purposes, hearths, dampers for heating, warming pans, radiator caps, radiators, petroleum stoves, heaters for instant hot water, air heating furnaces, fairy lights for festive decoration, germicidal lamps, gas ranges, gas cooking ovens for household purposes, kitchen sinks, gas scrubbers, air purifiers, air conditioners, fluid circulating apparatus to be used for boilers,...