- Grindstone (tool)
A grindstone is a tool used for grinding or sharpening tools.
Early grindstones were made from
sandstone, often in the shape of a wheel so that they could be rotated to speed the sharpeningprocess.
Grindstone machines usually have pedals in which to speed and slow the stone to sharpen
metalto the point of perfection.
[http://en.wikipedia.org/wiki/Berea%2C_Ohio Berea-"The Grindstone Capital of the World"]
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