2. Qingdao Tongruijia Machinery Co., Ltd. Qingdao Tongruijia Machinery Co., Ltd. was established on August 3, 2065438, and its business scope includes R&D, manufacturing, sales and installation: mechanical equipment and accessories; Wholesale and retail: building materials, rubber products, metal products, decorative materials, plastic products, Wujinjiaodian, chemical products (excluding dangerous chemicals and precursor chemicals), electronic products, power tools, office supplies, daily necessities, auto parts, knitwear, wires and cables; Hydropower warm installation project; Import and export of goods and technology.