Hammock., patent, October 2, 1888; (https://texashistory.unt.edu/ark:/67531/metapth171859/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Hammock., patent, October 2, 1888; (https://texashistory.unt.edu/ark:/67531/metapth171859/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .