Drill-Cable Clamp., patent, May 6, 1913; (https://texashistory.unt.edu/ark:/67531/metapth854105/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Drill-Cable Clamp., patent, May 6, 1913; (https://texashistory.unt.edu/ark:/67531/metapth854105/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .