Beijing weinau science and technology ltd., with its registered address on the 3rd floor of beijing refining pond accommodation services ltd., no. 33 east street drum building, changping city, beijing, is the changping branch of the beijing city administration of commerce and industry. The legal entity is represented by yang junsen, who operates in the areas of technical services and technology promotion; marketing computer software and assistive equipment, mechanical equipment, electronics, hardware exchange, construction materials, instrumentation forms, metal materials, chemical products (other than dangerous chemicals) and cultural goods. (projects subject to legal approval, which operate on the basis of the approval of the relevant department