Rotary Boring Drill Page: 1 of 7
View a full description of this patent.
Reference the current page of this Patent.
Rotary Boring Drill, patent, December 19, 1916; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth857719/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.