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in subjects: "sharpening"  
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Hoe-Sharpening Device.

Description: Patent for a mechanical hoe sharpening device with a holder for the hoe blade and a file that is operated by a lever.
Date: May 21, 1907
Creator: Criddle, Thomas B.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Saw-Filing Machine.

Description: Patent for a gin and linter saw filing machine that is fully automatic and can sharpen multiple saws in succession and then stop when finished without resetting the device or manually stopping it. It also can sharpen saws of varying sizes and thicknesses to different levels of sharpness.
Date: March 5, 1907
Creator: Beaver, John M.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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