Production and sales of air filters (high efficiency no baffle filter, high efficiency with baffle filter); Engaged in the wholesale, commission agency (except auction) and import and export business of similar commodities and supporting commodities (filter paper, filter cotton) produced by the company (does not involve state-owned trade management commodities, involving quotas, license management commodities, in accordance with the relevant provisions of the state to apply), and provide related supporting services. (For projects subject to approval according to law, business activities can only be carried out after approval by relevant departments) General projects: gas and liquid separation and pure equipment manufacturing; Gas, liquid separation and purification equipment sales; Mechanical equipment research and development; Machinery and equipment sales; Research and development of intelligent robots; Intelligent robot sales; Industrial robot manufacturing; Industrial robot sales; Industrial robot installation and maintenance; General mechanical equipment installation services; Sales agent; Import and export agent; Technical service, technology development, technology consultation, technology exchange, technology transfer, technology dissemination; Import and export of goods; Technology import and export; Industrial engineering design services; Hardware products wholesale; Hardware products retail; Sales of plastic products; Sales of chemical products (excluding licensed chemical products) (except for projects subject to approval according to law, independently carry out business activities according to law with business licenses)