Ventilator-Flue., patent, May 27, 1902; (https://texashistory.unt.edu/ark:/67531/metapth511011/m1/1/: accessed July 11, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Ventilator-Flue., patent, May 27, 1902; (https://texashistory.unt.edu/ark:/67531/metapth511011/m1/1/: accessed July 11, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .