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Nut Lock

Description: Patent for a nut lock. Illustration included.
Date: August 9, 1904
Creator: Payne, Newton & Guynes, Allen Perry
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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