The registration address of san jiamen industries ltd. In lanzhou, kansu province, is located at the e210022st floor 003st floor of the yide business and trade city first launch zone in zhuangzhou, kansu province. The registration authority is the market supervision authority of zhong chong county, lanzhou city. The legal person is represented by yao, and its operations include general projects: manufacturing and processing of doors and windows; sale of doors and windows; sale of metal tools; sale of construction materials; sale of building and decoration materials; sale of metal accessories; repair of metal products; sale of metal products; wholesale distribution of pentafin products; sale of fire-fighting equipment; sale of non-ferrous metal products; sale of spare parts; sale of furniture; sale of glass; sale of seals; sale of high-capacity sealed materials; integration of the control system; installation of indoor wooden windows; sale of chemical products (without authorization); sale of plastic products; sale of non-metal mines and products; sale of non-ferrous metal products; sale of non-ferrous metal; sale of furniture; sale of spare parts; sale of furniture; manufacture of glass; sale of glass (in addition to projects subject to legal authorization, operating independently of the law on the basis of a business licence)***