The registered address of std ltd. Is located at 4th gate 201, building no. 53, wishang development industrial park, zinnam township, tianjin city. The registered authority is the market supervision authority of zinnam district, tianjin city. The legal entity is represented by hao jinghui, who operates on the basis of technical development, transfer, consultancy and services of environmentally friendly equipment; cleaning supplies, cleaning equipment, hotel supplies, daily department goods, hardware, power supply, chemical materials (except dangerous goods), construction materials, plastics, office supplies, textiles, safety protection items, wholesale and retail distribution of paper products; cleaning services; and cleaning equipment maintenance services. (projects subject to legal approval may not operate without the approval of the relevant department)