Lubricating Appara, patent, December 12, 1916; (https://texashistory.unt.edu/ark:/67531/metapth859366/m1/1/: accessed May 8, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Lubricating Appara, patent, December 12, 1916; (https://texashistory.unt.edu/ark:/67531/metapth859366/m1/1/: accessed May 8, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .