Whiffletree., patent, May 28, 1889; (https://texashistory.unt.edu/ark:/67531/metapth172057/m1/1/: accessed July 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Whiffletree., patent, May 28, 1889; (https://texashistory.unt.edu/ark:/67531/metapth172057/m1/1/: accessed July 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .