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Loose-Leaf Binder.

Description: Patent for a loose-leaf binder for medicine prescriptions, which is easier to open and close than previous ones.
Date: July 23, 1907
Creator: Perkins, John Hardeman
Partner: UNT Libraries Government Documents Department

Double Speed Engine

Description: Patent for a double speed engine. Illustrations included.
Date: July 12, 1904
Creator: Richards, Oliver L.
Partner: UNT Libraries Government Documents Department
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