Collection
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Underreamer for Reaming Out Producing-sands.
Patent for "underreaming tools or bits which can be adjusted from the top of the well and which can be set at the required angle..."
Date:
September 21, 1920
Creator:
Lambeth, Acey L.
System:
The Portal to Texas History
Paint.
Patent for paints for roofs and for barns to prevent leaks and efficient in preserving the material of buildings at a relatively small costs.
Date:
July 20, 1920
Creator:
Watson, Grover C.
System:
The Portal to Texas History
Apparatus for Separating or Concentrating Ores
Patent for improvements in apparatus for separating or concentrating ores through a flotation method.
Date:
August 31, 1920
Creator:
Cole, David
System:
The Portal to Texas History