Automatic Air and Gas Relief Valve for Oil-Distributing Systems.
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Automatic Air and Gas Relief Valve for Oil-Distributing Systems., patent, May 24, 1921; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1259050/: accessed April 27, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.