Devoissaud, John P. Main Slide-Valve and Throttle-Valve for Steam-Engines., patent, December 4, 1894; (https://texashistory.unt.edu/ark:/67531/metapth173871/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .