Rotary-Engine., patent, January 20, 1880; (https://texashistory.unt.edu/ark:/67531/metapth169948/m1/1/: accessed May 4, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Rotary-Engine., patent, January 20, 1880; (https://texashistory.unt.edu/ark:/67531/metapth169948/m1/1/: accessed May 4, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .