Roof Screw., patent, September 23, 1890; (https://texashistory.unt.edu/ark:/67531/metapth172474/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Roof Screw., patent, September 23, 1890; (https://texashistory.unt.edu/ark:/67531/metapth172474/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .