http://pastport.jp/user/qingchenyu ja-JP We are a leading manufacturer of plastic extrusion equipment, specializing in the production of plastic pipe production lines, HDPE Pipe Butt Fusion Machine and plastic recycling machinery. 2024-02-23T11:03:20+0900 http://pastport.jp/user/qingchenyu/timeline/ZHANG%20JIA%20GANG%20QING%20CHEN%20YU%20MACHINERY%20CO.%2CLTD qingchenyu http://pastport.jp/user/qingchenyu/timeline/ZHANG%20JIA%20GANG%20QING%20CHEN%20YU%20MACHINERY%20CO.%2CLTD