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    • Chu Yang

      Greatwall Tunneling Systems http://microtunnelboringmachine.com/about.asp #GreatWall #microtunneling

      • Chu Yang

        Yd1000 Microtunneling Boring Machine/ Pipe Jacking Machine https://greatwall-mtbm.en.made-in-china.com/product/xyLmUNzKCoVe/China-Yd1000-Microtunneling-Boring-Machine-Pipe-Jacking-Machine-Tunneling.html #Chine #microtunneling

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      cover tunnel photo by: Matt Brown from London, England / CC BY

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