Measuring Device, patent, June 15, 1915; (https://texashistory.unt.edu/ark:/67531/metapth859862/m1/1/: accessed June 30, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Measuring Device, patent, June 15, 1915; (https://texashistory.unt.edu/ark:/67531/metapth859862/m1/1/: accessed June 30, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .