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SGT Unit Supply Specialist
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PO1 William "Chip" Nagel
..."To lift the tons of wood and stone needed to finish the castle's outer walls, two men walk inside a contraption that looks much like a giant hamster wheel. It's a kind of medieval crane with a central axle and ropes. Known as a treadmill crane, it can pivot and raise or lower materials, depending on which way the workers walk inside it. The only modern addition at Guédelon is a safety brake."...
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