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Knee-Protector.

Description: Patent for a durable, sleeve-like knee protector which contours the knee for comfort and allows for easy application and removal. Includes instructions and an illustration.
Date: December 9, 1913
Creator: McCall, Dougald Bell
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Engine-Valve.

Description: Patent for an engine valve for air brake systems on trains, which governs the pressure of air released and keeps it steady.
Date: August 9, 1910
Creator: Dillander, John
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Ariel Navigation

Description: Patent for an airplane which will maintain its balance in the air and can be easily maneuvered up and down and around in the air.
Date: May 9, 1911
Creator: Nichols, Jack Lloyd
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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