Boiler-Cleaner, patent, January 1, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1257745/m1/1/: accessed July 1, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Boiler-Cleaner, patent, January 1, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1257745/m1/1/: accessed July 1, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .