Valve Construction, patent, February 5, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1258954/m1/2/: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Valve Construction, patent, February 5, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1258954/m1/2/: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .