Zhang jia hong kong city executive board, with legal representatives, is the registered address of the sioux state environmental technology company ltd., located in the city of zhang jia hong kong, in yong lok, and operates in the field of technical research and development, technical advice, technology transfer and related technical services in the field of environmental protection; environmental equipment and components, filtering equipment and components, hardware, rubber products, metal materials, metal products and appliances; and self-employment and brokering in the import and export of goods and technologies。