The registration address of cheng dhui science and technology limited is located at building no. 522 of the 2nd street of the chenghua district of sichuan province, located on the 2nd street of the cheng dynamite. The registration authority is the shang hua market supervision authority, represented by a legal person, and covers the development of air purification products, medical devices; the production, sale, installation, maintenance and technical services of oxygen supply systems at medical centres, medical centre attraction systems; and the production, sale and installation of: vacant equipment, mechanical and electrical equipment, medical equipment i and ii (excluding licensed items). (projects subject to legal approval are not allowed to operate without the approval of the relevant authorities)。