Air-Propeller, patent, April 9, 1912; (https://texashistory.unt.edu/ark:/67531/metapth513517/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Air-Propeller, patent, April 9, 1912; (https://texashistory.unt.edu/ark:/67531/metapth513517/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .