Mechanical Toy Hoop, patent, September 5, 1916; (https://texashistory.unt.edu/ark:/67531/metapth859699/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Mechanical Toy Hoop, patent, September 5, 1916; (https://texashistory.unt.edu/ark:/67531/metapth859699/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .