The business scope includes general items: Design, manufacture, installation and sales of dust removal equipment and accessories, construction machinery equipment and accessories; Installation and sales of conveying equipment; Sales of valves, oil pumps, measuring tools, flat plates, castings, stamping parts, power equipment, and chemical equipment; Processing and sales of instrumentation, welding parts and pipe fittings; Machining; Import and export of goods (except for projects subject to approval in accordance with the law, independently carry out business activities with a business license in accordance with the law)