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The HZS/HLS series of concrete mixing plants/towers (HZS/HLS40-180) are developed by HONGDA GROUP on the basis of bringing in the world’s frontier technologies, combining the advantages and technologies of the sophisticated domestic and foreign machines that have emerged in recent years, and taking advantage of the company’s experience in manufacturing concrete mixing equipment for many years. Having reached the national standards, this series of products have passed the test by the NationalBuilding and City Construction Machinery Quality Supervision and Testing Center of China. Besides, products of this series have alsopassed the sci-tech achievement appraisal carried out by the National Science and Technology Commission of China and organized by Shandong Provincial Department of Science and Technology. According to their appraisal, this series of products are “the only products in the same field that have reached the advanced domestic level in general index and attained the advanced world level in such aspects as productivity, noise control, operation and environmental production”. The HZS180 concrete mixing plant in this series was appraised as a new key product of China in 2005.