Production of hazardous chemicals; production of food additives; inspection and testing services; maintenance of railway locomotives and vehicles. General items: Manufacturing of synthetic materials (excluding hazardous chemicals); sales of chemical products (excluding licensed chemical products); advertising production; advertising design and agency; fire protection technical services; technical services, development, consulting, exchange, transfer, and promotion; auxiliary activities for railway transportation; production of third-category non-pharmaceutical precursor chemicals; production of chemical products (excluding licensed chemical products).