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2号缓冲器(改进)的30套样品已于1987年6月6日在天津机车车辆机械工厂组装完毕。这次组装的样品,分为三个主方案。试验的改进方案是由天津机车车辆机械工厂、西南交通大学和铁道部科学研究院机车车辆
30 sets of samples of Buffer No. 2 (improved) were assembled on June 6, 1987 in Tianjin Rolling Stock Works. The assembled sample is divided into three main programs. Test improvement program is from the rolling stock machinery factory in Tianjin, Southwest Jiaotong University and the Ministry of Railways Institute of Science and Technology rolling stock