Hebei bandarda environmental technology ltd., with its registered address in the hebei river inter-economic development zone (east region), is the inter-river market supervision authority, represented by legal persons, wang quin, and operates in the areas of environmental technology development promotion services; production, sale of water treatment agents (except for hazardous chemicals); sale of temperature-conserving materials, waterproofing materials, rubber products, chemical products (except for hazardous chemicals); processing, marketing, installation of sewage treatment devices; and specialized cleaning services for mechanical equipment. (projects subject to legal approval may not operate without the approval of the relevant department)