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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.
Partner: UNT Libraries Government Documents Department

Pneumatic Jet for Conveyers

Description: Patent for a pneumatic jet that uses steam jets to provide power for various tasks such as distributing seed cotton or elevating coal. Illustrations included.
Date: September 21, 1909
Creator: Rice, Earley W.
Partner: UNT Libraries Government Documents Department
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