Improvement in Spark-Conductors for Railroad-Trains.
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Improvement in Spark-Conductors for Railroad-Trains., patent, April 27, 1869; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth165172/: accessed April 23, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.