Method of Casting Chilled Valve-Seats, patent, March 11, 1919; (https://texashistory.unt.edu/ark:/67531/metapth1258436/m1/2/: accessed June 30, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Method of Casting Chilled Valve-Seats, patent, March 11, 1919; (https://texashistory.unt.edu/ark:/67531/metapth1258436/m1/2/: accessed June 30, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .