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Hydraulic Classifier.

Description: Patent for hydraulic classifier for the treatment of ore. The invention subjects settling solid particles to a secondary classification and prevent the contamination of the settling solids before they are discharged.
Date: March 21, 1922
Creator: Allen, Charles
Partner: UNT Libraries Government Documents Department

Building Construction

Description: Patent for building construction that is new and a useful improvement to sleeping porch construction.
Date: March 14, 1922
Creator: Trost, Henry Charles
Partner: UNT Libraries Government Documents Department
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