Construction machinery and equipment leasing; Leasing services (excluding licensed leasing services); Sales of construction machinery; Casting machinery sales; Machinery and equipment sales; Machinery and equipment leasing; Mechanical equipment research and development; Mining machinery sales; Mechanical and electrical equipment sales; Agricultural machinery leasing; Agricultural machinery sales; Environmental emergency testing instrument sales; Sales of special instruments for geological exploration and earthquake; Installation and maintenance of specialized machinery for agriculture, forestry, animal husbandry and secondary fishery; Labor service (excluding labor dispatch) (Except for items subject to approval according to law, independently carry out business activities according to law with business license)