Pre-stressed corrugated pipes, anchoring devices, plastic products, metal products processing and manufacturing; pre-stressed machinery manufacturing; pre-stressed construction engineering; processing and manufacturing of pre-stressed steel strand, acoustic pipes, hollow anchor bars; wholesale and retail of building materials; engaged in import and export business permitted by national laws and regulations; manufacturing and selling of pipe materials, pipelines, and distribution cabinets. (Operate as required by law, scope of authorization provided by the administrative license)