Churn., patent, July 2, 1901; (https://texashistory.unt.edu/ark:/67531/metapth511438/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Churn., patent, July 2, 1901; (https://texashistory.unt.edu/ark:/67531/metapth511438/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .