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Gollner, Ervin G. & Fretz, Emil.Improvement in Automatic Fan,
patent,
April 25, 1876;
[Washington D.C.].
(https://texashistory.unt.edu/ark:/67531/metapth166541/:
accessed May 7, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu;
crediting UNT Libraries Government Documents Department.