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Back-Pressure Valve

Description: Patent for a back pressure valve for well drilling which may be "removed from the well with facility and despatch" (lines 18-20).
Date: January 18, 1910
Creator: Neighbors, Charles C.
Partner: UNT Libraries Government Documents Department

Paper File and Binder.

Description: Patent for a paper file and binder, which is expandable for varying amounts of pages and holds the papers firmly in the binder, but also allows easy removal.
Date: January 25, 1910
Creator: Springall, Walter A.
Partner: UNT Libraries Government Documents Department
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