Sutton, Henry M. Process of and Apparatus for Sizing or Classifying Comminuted Materials., patent, June 1, 1915; (https://texashistory.unt.edu/ark:/67531/metapth858872/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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