Drill Bit Page: 1 of 3
Reference the current page of this Patent.
Drill Bit, patent, February 14, 1922; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1259428/m1/1/?rotate=270: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.