Telephone-Switch Page: 4 of 4
Reference the current page of this Patent.
Telephone-Switch, patent, April 30, 1907; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth513299/m1/4/?rotate=180: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.