Sutton, Henry M.; Steele, Walter L. & Steele, Edwin G. Dry Ore Concentrator, patent, December 15, 1903; (https://texashistory.unt.edu/ark:/67531/metapth515010/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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