Patent for Automatic Shift for Saw Sharpening Machines
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Patent for Automatic Shift for Saw Sharpening Machines, patent, January 2, 1917; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth859616/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.