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Ratchet Die-Stock

Description: Patent for improvement on the usage of die-stocks which are used to cut and thread metal objects such as pipes.
Date: July 22, 1919
Creator: Hestand, Rue S.
Partner: UNT Libraries Government Documents Department

Lubricator

Description: Patent for a lubricator for locomotives and steam engines. Illustrations included.
Date: November 22, 1910
Creator: Coppers, John Andrew & Booth, Eldredge Early
Partner: UNT Libraries Government Documents Department

Recording Device

Description: Patent for an improved device that records flow of grain in a mill.
Date: July 22, 1911
Creator: Hoover, Guy F.
Partner: UNT Libraries Government Documents Department

Railway-Switch

Description: Patent for a railway switch.
Date: February 22, 1910
Creator: Shellenberger, Samuel L.
Partner: UNT Libraries Government Documents Department
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