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UnderfrictionThe underfriction wheel is a wheel used on rollercoaster trains that allows them to stay on track under intense movement. It was patented in 1919 by John Miller. |
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07-14-2008 23:18:10
The contents of this article are licensed from Wikipedia.org under the GNU Free Documentation License. How to see transparent copy
The contents of this article are licensed from Wikipedia.org under the GNU Free Documentation License. How to see transparent copy
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