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in subjects: "triple valves"  
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Primary view of Triple Valve for Fluid-Pressure Brakes.
Robinson, John W. & Douglas, Frank L.
October 10, 1911
Primary view of Triple Valve
Anderson, Williamson D. & Shearer, Edward J.
August 13, 1912
Primary view of Means for Grinding Triple Valves.
Innis, Ezra E.
July 27, 1909
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