Display-Board, patent, September 30, 1913; (https://texashistory.unt.edu/ark:/67531/metapth853585/m1/3/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Display-Board, patent, September 30, 1913; (https://texashistory.unt.edu/ark:/67531/metapth853585/m1/3/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .