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Improvement in Rotary Cultivators.

Description: Patent for a machine for "opening ditches to drain land and form fences, and to grade railroads, &c." (lines 15-17) including illustrations and instructions.
Date: October 10, 1876
Creator: Tadlock, Sevier
Partner: UNT Libraries Government Documents Department

Triple Valve for Fluid-Pressure Brakes.

Description: Patent for a triple valve for fluid-pressure brakes in trains that prevents accidental triggering of the emergency brakes.
Date: October 10, 1911
Creator: Robinson, John W. & Douglas, Frank L.
Partner: UNT Libraries Government Documents Department

Exhaust-Steam-Actuating Damper-Regulator.

Description: Patent for exhaust-steam-actuating damper-regulator, including instructions and illustrations. This invention improves oil burning equipment for locomotives by "operating the dampers of the air inlet box to automatically close the dampers when the locomotive is standing and to open the dampers when the locomotive is running." (lines 12-16).
Date: July 10, 1917
Creator: Gilman, Benoist P.
Partner: UNT Libraries Government Documents Department
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