Automatic Dumping-Elevator, patent, November 16, 1909; (https://texashistory.unt.edu/ark:/67531/metapth514341/m1/1/: accessed June 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Automatic Dumping-Elevator, patent, November 16, 1909; (https://texashistory.unt.edu/ark:/67531/metapth514341/m1/1/: accessed June 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .