Valve., patent, January 5, 1897; (https://texashistory.unt.edu/ark:/67531/metapth174485/m1/4/: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Valve., patent, January 5, 1897; (https://texashistory.unt.edu/ark:/67531/metapth174485/m1/4/: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .