Rotary Engine., patent, July 30, 1907; (https://texashistory.unt.edu/ark:/67531/metapth512915/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Rotary Engine., patent, July 30, 1907; (https://texashistory.unt.edu/ark:/67531/metapth512915/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .