The registration office is the market supervisory authority for the high-risk zhang city market, represented by the legal person, and includes ventilation equipment such as wind vents, wind valves and their accessories, refrigeration equipment, environmental protection equipment, human defence equipment, air conditioning equipment, ventilation pipes, glass and steel products, electrical, electrical and electrical equipment production, sale and installation; metal works, mechanical equipment processing and sale. (projects subject to legal approval may not operate without the approval of the relevant department)