Oil Cup For Wagon Wheels, patent, October 23, 1917; (https://texashistory.unt.edu/ark:/67531/metapth854163/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Oil Cup For Wagon Wheels, patent, October 23, 1917; (https://texashistory.unt.edu/ark:/67531/metapth854163/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .