Switch-Operating Device. Page: 2 of 4
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Switch-Operating Device., patent, October 14, 1913; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth853803/m1/2/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.