Grindstone Attachment., patent, June 30, 1891; (https://texashistory.unt.edu/ark:/67531/metapth172731/m1/1/: accessed July 1, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Grindstone Attachment., patent, June 30, 1891; (https://texashistory.unt.edu/ark:/67531/metapth172731/m1/1/: accessed July 1, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .