When was the telephone invented?

/kloc-one day in 0/849, when Antonio Muzzi prepared a set of instruments for his friend's treatment in another room, an unexpected miracle appeared. He clearly heard his friend's voice coming from the other room through the wire connecting the two rooms.

In 1860, Antonio Muzzi showed the system to the public, and published an introduction about the invention in an Italian newspaper in new york.

Extended data:

In 1876, Bell connected two transmitters and receivers with the same structure with two wires, and the electromagnet was equipped with a diaphragm, which realized the communication between the two ends for the first time. But the call distance is short and the efficiency is low. He obtained the patent right of the world's first available telephone and founded the Bell Telephone Company (AT & amp； The predecessor of t company).

Later 1877, T.E. Edison invented the carbon microphone and induction wire, which extended the communication distance. Carbon microphone appeared in 1878, which greatly improved the efficiency of telephone microphone. The receiver structure has also been improved. The earliest telephone was a magnet telephone, which was powered by its own battery and sent a call signal with a hand-cranked generator.

1880 * * electric telephone appeared, which was powered by * * * electric switch in a centralized way, saving the hand-broadcast generator and dry battery.

189 1 year, a.b. strowger invented the automatic telephone. It can send out DC dialing pulse, control the action of automatic exchange, select the called user and automatically complete the transfer function. Thus pushing telephone communication to a new stage. By the end of 1960s, push-button all-electronic telephone appeared.

Baidu Encyclopedia-Antonio Muzzi