Development, production, and sales of various modified vehicles, special-purpose vehicles, transport vehicles, and their parts; automotive sales and maintenance services; production and sales of mechanical products and metal structural parts; factory leasing; tank inspection for tank-type transport vehicles; development, construction, operation, and leasing of warehousing and supporting facilities; import and export of metal materials, hardware and electrical products, electromechanical equipment, and commercial vehicles; mechanical equipment maintenance; sales of chemical products (excluding hazardous items); and insurance agency business.