Automatic Danger-Signal for Railroads.
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Automatic Danger-Signal for Railroads., patent, February 26, 1895; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth173929/: accessed April 30, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.