Improvements in Expanding Mandrels., patent, January 23, 1872; (https://texashistory.unt.edu/ark:/67531/metapth165319/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Improvements in Expanding Mandrels., patent, January 23, 1872; (https://texashistory.unt.edu/ark:/67531/metapth165319/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .