Roll-Holder, patent, January 28, 1913; (https://texashistory.unt.edu/ark:/67531/metapth512520/m1/1/: accessed July 4, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Roll-Holder, patent, January 28, 1913; (https://texashistory.unt.edu/ark:/67531/metapth512520/m1/1/: accessed July 4, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .