Hotel Key Tag, patent, February 6, 1917; (https://texashistory.unt.edu/ark:/67531/metapth858161/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Hotel Key Tag, patent, February 6, 1917; (https://texashistory.unt.edu/ark:/67531/metapth858161/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .