Crate., patent, July 27, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1259237/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Crate., patent, July 27, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1259237/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .