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Spark-Plug

Description: Patent for improvement of spark-plugs, an automotive engine component.
Date: September 2, 1919
Creator: Hill, John L.
Partner: UNT Libraries Government Documents Department

Improvement in Hydraulic Packings

Description: Patent for an improvement in hydraulic packing for use in hydraulic rams. Includes illustration and description.
Date: September 2, 1879
Creator: Riesel, Henry
Partner: UNT Libraries Government Documents Department
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