Metalworking machinery manufacturing; General parts manufacturing; Mechanical parts and components processing; Mechanical parts and components sales; Metal material sales; Concrete structural component sales; Bearing sales; Pump and vacuum equipment sales; Cement product manufacturing; Cement product sales; Valve and cock sales; Wire and cable operation; Hardware product retail; Rail transit specialized equipment, key systems and parts sales; High-speed rail equipment and accessories sales; Railway locomotive and rolling stock parts sales; Railway locomotive and rolling stock parts manufacturing; Power electronic component sales; Electrical signal equipment device sales; Industrial automatic control system device manufacturing; Industrial automatic control system device sales; Electrical instrument and meter sales; Rubber product sales