Telephone-Switch
Creation Information
Context
Audiences
patent as a primary source within our collections. Researchers, educators, and students may find this patent useful in their work.
We've identified thisContact Us
Subjects
Mapped Locations
Telephone-Switch, patent, April 30, 1907; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth513299/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.