Mechanism for Gradually Changing Rotative Velocity.
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Mechanism for Gradually Changing Rotative Velocity., patent, August 15, 1911; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth510076/: accessed May 1, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.