Pump-Piston., patent, May 4, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1259313/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Pump-Piston., patent, May 4, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1259313/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .