Hebei ingyong science and technology development co. Ltd. Is registered at no. 176, small and medium enterprises entrepreneurship zone (smez) of the zhuong county economic development zone, habei province. The zhang county market supervisory authority, represented by legal persons, is han bao-hung and operates in general terms: technical services, technology development, technical advice, technology exchange, technology transfer and technology promotion; property management; professional cleaning, cleaning, disinfection services; domestic service; daily residential services; cleaning services for buildings; maintenance services for the installation of water and electricity in residential areas; repair of electrical appliances; installation services for household appliances; sale of machinery and equipment; sale of mechanical and electrical equipment; manufacture of specialized equipment for environmental protection; sale of specialized equipment for environmental protection; sale of fibreglass fibres and products; manufacture of fibre-optic reinforced plastics; sale of fibreglass enhanced plastics; manufacture of dust removal technology equipment; manufacture of coal smoke and gas dethion equipment; sale of coal smoke and gas defouling equipment; sale of instrumentation equipment; sale of spare parts, parts and components; sale of metal materials; sale of plastics; sale of paints (without dangerous chemicals); sale of construction materials; sale of architectural and decoration materials; repair of general equipment; repair of specialized equipment; maintenance of electronic and mechanical equipment (without special equipment); construction of forest greening works; planning design management (in addition to projects subject to authorization under the law, the operation of the business is carried out autonomously under a licence)