Combination-Flue., patent, January 20, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1258738/m1/1/: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Combination-Flue., patent, January 20, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1258738/m1/1/: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .