Beijing yenfron science and technology ltd. Is registered at the 24th floor of the golden star road, 24th floor, beijing city, with a registration authority, the beijing city market supervision authority, with legal representation, and covers general projects: technical services, technology development, technical advice, technology exchange, technology transfer, technology promotion; instrumentation repair; engineering and technical research and test development; metrology services; sale of office equipment; metal surface treatment and thermal processing; repair of general equipment; development of new material technology; sale of electrical appliances; sale of chemical products (other than licensed chemical products); specialized repair of communications transmission equipment; sale of machinery equipment; sale of building materials; electroplating; plastic surface treatment; industrial design services; repair of electrical equipment; specialized equipment repair; operational train...