Automatic Rotary Hydraulic Casing-Spear. Page: 1 of 6
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Automatic Rotary Hydraulic Casing-Spear., patent, December 26, 1905; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth513981/m1/1/: accessed June 11, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.