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Precision sheet metal:0086-13906299132
Spiral steel pipe,Steel bridge pier and ocean platforms:0086-13962969008
Power transformation structures:0086-513-85151216
Web site：www.nttonglian.com
E-mail：nttl5568512@126.com
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Precision sheet metal:0086-13906299132
Web site：www.nttonglian.com 
大型螺旋管生产线