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Nut Lock.

Description: Patent for a keyed lock for nut and bolt that is removable and does not damage the threads.
Date: December 20, 1892
Creator: Crisp, James E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Guard-Rail.

Description: Patent for guard rails for use in connection with frogs or switches, including illustrations.
Date: May 8, 1900
Creator: Murphy, John
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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