The registration address of the rock refined surface processing materials ltd. In dongqing city is located in room 201, no. 29, xinshan hill road, dongqing town, guangdong province. The registration authority is the market supervision authority of dongqing city, represented by a legal person, chen riny, and operates in the following areas: distillation materials, surface treatment materials, grinding materials, polishing materials, sand jets, sand jet fittings, general machinery equipment and accessories, and hardware. (projects subject to legal approval to operate with the approval of the relevant department)