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Improvement to Lifting-Jacks

Description: Patent for the improvement of the lifting jack which allows the user to "lower the lifting bar by a step-by-step movement as well as to elevate the lifting bar by such a movement (lines 12-14). Includes instructions and illustration."
Date: January 12, 1915
Creator: Parker, Charles W. & Wittliff, Theodore H.
Partner: UNT Libraries Government Documents Department

Spark Plug for Internal-Combustion Engines

Description: Patent for an improved automobile spark-plug with both insulated and non-insulated cylinders that will activate with any spark to the device.
Date: January 18, 1915
Creator: Loose, Robert D.
Partner: UNT Libraries Government Documents Department

Plow.

Description: Patent for "heel sweeps" for plows, which are a construction of wings that that sweep the furrow on either side of the plow.
Date: January 5, 1915
Creator: Randolph, James W.
Partner: UNT Libraries Government Documents Department
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