General items: manufacturing of special equipment for agricultural and sideline food processing; manufacturing of special equipment (excluding licensed professional equipment); manufacturing of refrigeration and air conditioning equipment; sales of special equipment for agricultural and sideline food processing; sales of mechanical equipment; manufacturing of metal tools; sales of hand carts and animal-drawn vehicles; manufacturing of metal packaging containers and materials; wholesale of kitchen, bathroom, and daily-use items; manufacturing of general equipment (excluding special equipment); manufacturing of metal processing machinery; manufacturing of daily-use metal products; manufacturing of special equipment for food, wine, beverages, and tea production; manufacturing of special equipment for commerce, catering, and services; sales of mechanical parts and components; research and development of mechanical equipment.