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Sulphur-Mining Apparatus.

Description: Patent for a thermal solvent based sulfur mining apparatus that is placed in a sulfur mining well. Utilizing thermodynamics, the apparatus has a new way to introduce air or steam into the various parts of the apparatus. It is designed with "simplicity and durability of construction" (lines 49-50).
Date: December 17, 1918
Creator: Carmichael, Robert E.
Partner: UNT Libraries Government Documents Department

Record-Book.

Description: Patent for a record book using primary and secondary indexing tabs for improving classification of documents.
Date: December 17, 1918
Creator: Sumners, Gustavus D.
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
Partner: UNT Libraries Government Documents Department
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