Telefónica

History of telecommunications

Telecommunications began to take on special relevance in the 19th century with the invention of the telegraph, although ...
insider.si.edu

The telephone and telephone exchanges: their invention and development [by] J E. Kingsbury

https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!19242~!0#focus ...
PBS

The Development of the Telephone

Though Joseph Henry earned his fame as the first director of the Smithsonian Institute, he was in many ways the telephone's first and best advocate. Alexander Graham Bell himself said as much when he ...
insider.si.edu

The telephone and telephone exchanges; their invention and development, [by] J. E. Kingsbury

https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!293039~!0#focus ...