Automatic Air and Gas Relief Valve for Oil-Distributing Systems. Page: 1 of 4
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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/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.