Apparatus For Cementing Wells. Page: 2 of 4
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Apparatus For Cementing Wells., patent, November 21, 1899; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth510600/m1/2/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.