■ Design, manufacturing, import and export, sales, brokerage of machinery and equipment related to heating and cooling, ventilation, sanitation, plumbing, drying, evaporation, combustion, refrigeration, ice making, air purification, temperature and humidity control, monitoring and control, and general heat exchange, as well as installation and maintenance related to these. ■ Buying, selling, and exchanging used machinery and equipment related to heating and cooling, ventilation, sanitation, plumbing, drying, evaporation, combustion, refrigeration, ice making, air purification, temperature and humidity control, monitoring and control, and general heat exchange.