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Lock-Washer.

Description: Patent for "an improved lock washer especially adapted for locking nuts" (lines 10-11) that was designed to "be interposed between the nut and a member to be clamped by the nut" (lines 14-16).
Date: June 8, 1920
Creator: Medbery, Clinton A.
Partner: UNT Libraries Government Documents Department

Blackboard.

Description: Patent for a rotating blackboard that can be covered when not in use, as well as adjusted to different heights and locked into place so the writer can utilize every available space of the blackboard. The inventor designed the blackboard "for use in schools and brokerage offices."
Date: March 8, 1921
Creator: Grothaus, Julia
Partner: UNT Libraries Government Documents Department

Shock-Absorber.

Description: Patent for an improved design of shock absorbers that gives vehicles a smoother ride.
Date: March 8, 1921
Creator: Swindowsky, Walter
Partner: UNT Libraries Government Documents Department

Cotton Picking Apparatus.

Description: Patent for cotton-picking apparatus. This apparatus supports complete removal of the cotton from plant without foreign objects or harm to plant.
Date: November 8, 1921
Creator: Alvin, Alleyne D.
Partner: UNT Libraries Government Documents Department
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