Telephones (1860): The first telephone concept invented by Johann Philipp Reis in 1860 introduces an electromagnetic device capable of relaying understandable sounds. A few years later, the first phone call was made between inventor Alexander Graham Bell and his assistant sitting 4.5 meters away on March 10, 1876 with a brief conversation: "Watson, you Come here, I have work to do! " is a historic event that officially marks the introduction of the intercom.
