The registration address of beijing green source field environmental technology ltd. Is located in building no. 209, no. 10, ma jibong town road, changbong town, changbing district, beijing city. The registration authority is the market supervision authority of changping district, beijing city. The legal entity is represented by li yanan and operates on general projects: technical services, technology development, technical advice, technology exchange, technology transfer, technology diffusion; laboratory analytical instrument manufacture; sale of experimental analytical instruments; manufacture of refrigeration, air-conditioning equipment; sale of refrigeration, air-conditioning equipment; construction of metal structures; marketing of metal structures; sale of construction materials; wholesale of hardware products; sale of lighting devices; sale of specialized chemical products (excluding dangerous chemicals); sewage treatment and their reuse; engineering and technical research and experimental development; import and export of goods. (except for projects subject to legal authorization, operating independently of the law by means of a business licence) (no activity shall be carried out in which the state and municipal industrial policy prohibits and restricts the operation of such projects