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Wrench

Description: Patent for a wrench. Illustration included.
Date: April 17, 1906
Creator: Hall, Samuel N. & Lawlor, James
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Centrifugal Pump

Description: Patent for centrifugal pump design meant to improve upon past models in which pieces of the pump wear out over time.
Date: December 17, 1918
Creator: Duda, Oswald
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Compound Air-Compressor.

Description: Patent for an improved Compound Air-Compressor by having four cylinders, in pairings of a high pressure and a low pressure cylinders. The air from the low pressure cylinder will be fed to the high pressure cylinder. The pistons will work in succession rather than simultaneously.
Date: February 17, 1920
Creator: Jones, Oceola
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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