Landing Device for Aeroplanes., patent, September 7, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1256832/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Landing Device for Aeroplanes., patent, September 7, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1256832/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .