Anti-Friction Sucker-Rod Coupling.
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Anti-Friction Sucker-Rod Coupling., patent, January 26, 1892; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth172921/: accessed April 20, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.