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Railroad-Tie.

Description: Patent for a "simple and effective railroad tie for supporting the rails and rigidly holding them in the position of use" (lines 19-21).
Date: January 30, 1894
Creator: Lee, John Chester
Partner: UNT Libraries Government Documents Department

Cut-off Valve for Pipe-Lines

Description: Patent for cut-off valve for pipe-lines intended for oil companies.
Date: April 30, 1918
Creator: Hagern, Joseph F.
Partner: UNT Libraries Government Documents Department

Valve Structure

Description: Patent for valve improvements in controlling the flow of fluids under high pressure.
Date: August 30, 1921
Creator: Anderson, Jalmer
Partner: UNT Libraries Government Documents Department
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