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Pump Jack

Description: Patent for an improved double-acting pump jack that will require less parts and external force to operate and maintain.
Date: April 29, 1919
Creator: Lively, William
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Car-Replacer

Description: Patent for car replacer. It is an improvement to "what is called a 'frog' or a 'shoe'." The invention involves "two frogs or shoes which are used together" and are used "in such a way as to replace a car truck. . ." (Ledbetter)
Date: December 1, 1914
Creator: Ledbetter, Louis H.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Cement Kiln

Description: Patent for a new and improved cement kiln for drying gypsum and other materials employed in the manufacture of cement and plaster.
Date: April 28, 1902
Creator: Malone, Samuel R.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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