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Toothbrush.

Description: Patent for a new and improved toothbrush that has a rotary brush which turns while the user brushes it back and forth over their teeth and a hollow stem that sends water to the brush while it is in use.
Date: November 2, 1920
Creator: Simon, John
Partner: UNT Libraries Government Documents Department

Seed-Selecting Mechanism.

Description: Patent for seed selecting mechanisms that plants or drops two seeds at the same time and can be attached to the hopper of a planter.
Date: June 15, 1920
Creator: Vest, Robert A.
Partner: UNT Libraries Government Documents Department
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