Boring Tool, patent, October 31, 1916; (https://texashistory.unt.edu/ark:/67531/metapth859861/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Boring Tool, patent, October 31, 1916; (https://texashistory.unt.edu/ark:/67531/metapth859861/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .