Manufacture of general parts; processing of mechanical parts and components; sales of mechanical parts and components; manufacture of rubber products; sales of rubber products; manufacture of plastic products; sales of plastic products; manufacture of seals; sales of seals; manufacture of railway locomotive and rolling stock parts; sales of railway locomotive and rolling stock parts; sales of mining machinery; sales of specialized equipment for oil drilling; manufacture of water transport equipment parts; sales of water transport equipment parts; manufacture of forgings and powder metallurgy products; sales of forgings and powder metallurgy products; manufacture of metal chains and other metal products; sales of metal chains and other metal products; research and development of metal products; repair of metal products; sales of metal products; manufacture of molds; sales of molds; sales of specialized chemical products (excluding hazardous chemicals); sales of chemical products (excluding licensed chemical products); manufacture of hardware products; wholesale of hardware products; retail of hardware products.