TOP 6 construction industry materials in Korea that are still going strong. 

TOP 6 construction industry materials in Korea that are still going strong.
1. process of making a solid concrete circular manhole.
2. Great process of mass-producing aluminum pipes. Large-scale aluminum extrusion plant in Korea
3. The process of building Korea's largest and largest drainage pipe. Mass production of large PE pipes
4. process of making a solid concrete water pipe.
5. The process of making the largest hexagonal nut on Earth. Korean metal factory
6. The process of making a giant bolt. Most Interesting Korean Metalwork
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