In shanghai, the registration address of one-on-one demonstration engineering ltd. Is located on the second floor of towers road, no. 18, 945 in the songjiang district of shanghai, with the registration authority being the market supervision authority of the songjiang district and the legal representative of cho mann, and covers general projects such as display design, production, exhibition services, interior and exterior services, professional design services, enterprise image planning, processing of wood products, hardware products, signs, plastics and sales of building materials. (in addition to projects subject to authorization under the law, the operation of the business is carried out autonomously under a licence)