Two-Stage Pump, patent, July 12, 1910; (https://texashistory.unt.edu/ark:/67531/metapth508836/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Two-Stage Pump, patent, July 12, 1910; (https://texashistory.unt.edu/ark:/67531/metapth508836/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .