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Triple Valve for Fluid-Pressure Brakes.

Description: Patent for a triple valve for fluid-pressure brakes in trains that prevents accidental triggering of the emergency brakes.
Date: October 10, 1911
Creator: Robinson, John W. & Douglas, Frank L.
Partner: UNT Libraries Government Documents Department

Triple Valve

Description: Patent for a triple valve for air brakes on trains that gives the engineer more control over the brakes.
Date: August 13, 1912
Creator: Anderson, Williamson D. & Shearer, Edward J.
Partner: UNT Libraries Government Documents Department

Means for Grinding Triple Valves.

Description: Patent for a device for grinding triple valves to proper sizes and shapes for them to be inserted into things.
Date: July 27, 1909
Creator: Innis, Ezra E.
Partner: UNT Libraries Government Documents Department
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