The telephone was invented in 1860.
One day in 1849, when Antonio Muzzi prepared a set of equipment to treat a friend in another room, an unexpected miracle occurred. By connecting a wire between the two rooms, he I clearly heard my friend's voice coming from the other room.
In 1860, Antonio Muzzi demonstrated this system to the public and published an introduction to the invention in an Italian-language newspaper in New York.
Extended information:
In 1876, Bell used two wires to connect two transmitters and receivers with the same structure and a vibrating diaphragm on the electromagnet. call. However, the call distance is short and the efficiency is low. He patented the world's first usable telephone and founded the Bell Telephone Company (the predecessor of AT&T).
Later, in 1877, T.E. Edison invented the carbon microphone and induction line, which extended the communication distance. In 1878, the carbon microphone appeared, which greatly improved the efficiency of telephone microphones. The receiver structure has also been improved. The earliest telephones were magnet telephones, which were powered by their own batteries and used a hand-cranked generator to send call signals.
In 1880, the electric telephone appeared, and the electric telephone was centralized powered by the electric switch, eliminating the need for hand-operated generators and dry batteries.
In 1891, A.B. Strowger invented the automatic telephone. , it can send out DC dialing pulses, control the action of the automatic switch, select the called user, and automatically complete the switching function. Thus pushing telephone communication to a new stage. By the late 1960s, touch-tone fully electronic telephones appeared.
Baidu Encyclopedia—Antonio Muzzi