Brewster, Bertram Forrest. Machine for Assorting, Stacking, and Counting Coins, patent, April 13, 1909; (https://texashistory.unt.edu/ark:/67531/metapth510781/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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