Sales of metal materials; Sales of building materials; Sales of petroleum products (excluding hazardous chemicals); Sales of mechanical parts and components; Wholesale of hardware products; Retail of hardware products; Sales of communication equipment; Sales of office equipment; Sales of machinery and equipment; Sales of metal products; Import and export of goods; Import and export of technology; Leasing of machinery and equipment; Loading and unloading; General cargo warehousing services (excluding hazardous chemicals and other items requiring license approval); Leasing of construction machinery and equipment; Sales of steel products for construction; Machinery for construction Sales; Sales of construction and decoration materials. (Except for projects that require approval according to law, business activities can be carried out independently with a business license and in accordance with the law)