Crank For Drilling Machines, patent, December 18, 1906; (https://texashistory.unt.edu/ark:/67531/metapth514065/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Crank For Drilling Machines, patent, December 18, 1906; (https://texashistory.unt.edu/ark:/67531/metapth514065/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .