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Back-Pressure Valve
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.
System:
The Portal to Texas History
Paper File and Binder.
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.
System:
The Portal to Texas History