Rotary Engine., patent, September 17, 1907; (https://texashistory.unt.edu/ark:/67531/metapth513373/m1/1/: accessed April 25, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Rotary Engine., patent, September 17, 1907; (https://texashistory.unt.edu/ark:/67531/metapth513373/m1/1/: accessed April 25, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .