Improvement in Rotary Engines. Page: 2 of 6
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Improvement in Rotary Engines., patent, February 6, 1872; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth165322/m1/2/: accessed June 24, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.