The registration authority is the market supervisory authority of the city of beijing, represented by a legal person, han bao kong, whose business includes general projects: sale of doors and windows; sale of construction materials; furniture installation and maintenance services; sale of special equipment; sale of synthetic materials; sale of water-proofing products; internet sales (commodities other than those authorized for sale); distribution of electrical switch control equipment; sale of anti-corruption materials; sale of daily ceramics; manufacture of building decorations, spare parts for water heating pipes and other construction metal products; sale of furniture spare parts; repair of daily products; sale of metal tools; professional design services; installation of indoor wood doors and windows; manufacture of doors and windows; sale of fire equipment; sale of metal structures. (a project subject to approval by law may only be carried out with the approval of the relevant ...