Internal Pipe-Gripper, patent, August 5, 1913; (https://texashistory.unt.edu/ark:/67531/metapth853625/m1/2/: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Internal Pipe-Gripper, patent, August 5, 1913; (https://texashistory.unt.edu/ark:/67531/metapth853625/m1/2/: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .