Rotary Reversible Engine, patent, October 19, 1909; (https://texashistory.unt.edu/ark:/67531/metapth509820/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Rotary Reversible Engine, patent, October 19, 1909; (https://texashistory.unt.edu/ark:/67531/metapth509820/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .