supervision and examination of 144 type of pre-stressed concrete industrial producing material, including industry of coal , metallurgy, petro chemistry, railway vehicle, such as dangerous industrial packaging container, rubber soft pipe and fittings, mechanic seal production, high strength fastener, steel wire, stainless steel production, drilling lift tool, fire proof door, fire extinguisher, wire of railway vehicle, pre-stressed concrete sleeper, elastic strip fastening, irrigation work metal structure, iron tower for power transmission line, electric power fitting, high performance fiber, high strength light alloy, aluminum foil, safe belt, safe net, foil of brake.