Rotary Boring Drill
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patent as a primary source within our collections. Researchers, educators, and students may find this patent useful in their work.
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Rotary Boring Drill, patent, December 19, 1916; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth857719/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.