The registration authority is the beijing city housing mountain market supervisory authority, with legal representation, and includes construction master contract; professional contracting; labour subcontracting; property management; real estate development; technology development; technical testing; sale of handicrafts, office supplies, electronics, stationery supplies, clothing and footwear caps, daily supplies, hardware and electricity (other than electric bicycles), doors and windows, metal products, mechanical equipment, electronics, construction materials, furniture, lamps, chemical products (other than dangerous chemicals), decorations; goods and exports; rental of machinery; engineering project management; engineering consulting; interior decoration design; electricity supply; engineering survey; and engineering design. (the market subjects are legally free to choose to operate projects and carry out their activities; the electricity supply, engineering survey, engineering design and legally approved projects are carried out on the basis of the approved content, with the approval of the relevant sector; and they are not allowed to engage in activities that are prohibited or restricted by the state and municipal industrial policy