The registration address of tianjin di's innovation metal products ltd. Is 50 metres south of the village of zhengjiang zhengjiang, tianjin city. The registration authority is the market supervision authority of the jinghai district of tianjin city, represented by legal persons such as zhang tomu, and is engaged in the manufacture of metal products; wholesale and retail distribution of construction materials, metal materials and hardware; processing and marketing of man-made diamond tools; and import and export of goods and technology (except for laws and regulations restricting import and export). (projects subject to legal approval may not operate without the approval of the relevant department)