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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

Clothespin

Description: Patent for an improved version of the clothespin, which is simple to use, durable, and cheap to manufacture.
Date: March 21, 1922
Creator: Ingersoll, Charles James
Partner: UNT Libraries Government Documents Department

Ice-Holding Device.

Description: Patent for a device to hold ice upon running-boards of vehicles (lines 10-11.) This device is flexible in use (it can be pulled up to reveal the ice, and put back out of the way), simple in design, and cheap to construct.
Date: March 21, 1922
Creator: Barton, Warren D.
Partner: UNT Libraries Government Documents Department
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