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Protractor.

Description: Patent for "improvements in drafting instruments and has particular application to a protractor or plotter." (lines 8-10)
Date: December 23, 1913
Creator: Ward, Walter P.
Partner: UNT Libraries Government Documents Department

Diffusion-Block for Subsoil Irrigation.

Description: Patent for a diffusion block for subsoil irrigation, which prevents roots from growing into the pipe that is providing water to the soil.
Date: August 23, 1910
Creator: Ziller, Bessie
Partner: UNT Libraries Government Documents Department

Shutter Slat Fastener

Description: Patent for a shutter slat fastener. Illustration included.
Date: May 23, 1911
Creator: Basnett, Augustus
Partner: UNT Libraries Government Documents Department
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