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Wheel Tread.

Description: Patent for wheel treads designed for heavy vehicles. The metal shoes on the tread are to help enable the vehicle to go over both hard and soft surfaces.
Date: February 8, 1921
Creator: Ingram, Joseph D.
Partner: UNT Libraries Government Documents Department

Triple-Valve Mechanism.

Description: Patent for a triple-value mechanism that "appertains to automatic fluid pressure brake systems and involves certain improvements &c., &c.” (lines 9-11) including instructions and illustrations.
Date: December 8, 1914
Creator: Atwood, Walter F.
Partner: UNT Libraries Government Documents Department
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