Automatic Switch Throwing Apparatus Page: 2 of 6
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Automatic Switch Throwing Apparatus, patent, December 5, 1916; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth859565/m1/2/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.