Automatic Gas Control for Gas Water-Heaters., patent, October 7, 1919; (https://texashistory.unt.edu/ark:/67531/metapth1258072/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Automatic Gas Control for Gas Water-Heaters., patent, October 7, 1919; (https://texashistory.unt.edu/ark:/67531/metapth1258072/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .