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Underreamer for Reaming Out Producing-sands.

Description: Patent for "underreaming tools or bits which can be adjusted from the top of the well and which can be set at the required angle..."
Date: September 21, 1920
Creator: Lambeth, Acey L.
Partner: UNT Libraries Government Documents Department

Paint.

Description: Patent for paints for roofs and for barns to prevent leaks and efficient in preserving the material of buildings at a relatively small costs.
Date: July 20, 1920
Creator: Watson, Grover C.
Partner: UNT Libraries Government Documents Department

Sling-Shot.

Description: Patent for a sling shot that is more durable, efficient, and less likely to break. Includes instructions and one illustration.
Date: July 13, 1920
Creator: Jones, Ralph L.
Partner: UNT Libraries Government Documents Department
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