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[Army Caterpillar Tractor]

Description: Photograph of an army caterpillar tractor pulling heavy artillery through mud. The flatbed wagon has become stuck in the mud. Marines are attempting to get the wagon out of the mud with the assistance of the tractor.
Date: [1910..1920]
Creator: Horne, Walter H., 1883-1921
Partner: El Paso Public Library

Piston

Description: The Patent for an improved piston to be used in connection with the cylinders of air brakes. The improvement involves making the removal and replacement of worn out packing material easier.
Date: July 22, 1913
Creator: King, Herbert G.
Partner: UNT Libraries Government Documents Department
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