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Knee Pad.

Description: Patent for an improved knee pad, which provides better ventilation and cushioning to the knee, including illustrations.
Date: November 21, 1922
Creator: Rylander, Parrish H.
Partner: UNT Libraries Government Documents Department

Electrolytic Cell

Description: Patent for an improved electrolytic cell that automatically maintains its predetermined amount of liquid.
Date: November 20, 1920
Creator: Walker, Thomas Bailey
Partner: UNT Libraries Government Documents Department
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