Vending Machine, patent, January 6, 1903; (https://texashistory.unt.edu/ark:/67531/metapth513768/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Vending Machine, patent, January 6, 1903; (https://texashistory.unt.edu/ark:/67531/metapth513768/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .