Vintage treadle wheel powered knife sharpener.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...n_fullsize.jpg
Previously:
Sharpening a pencil on a lathe - GIF and comic
Pencil sharpening machine - GIF
Sharpening a huge drill bit - GIF
Vintage razor sharpener - GIF
sharpening table saw blades at Quinn Saw
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