Trap., patent, February 10, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1256431/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Trap., patent, February 10, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1256431/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .