7 март 1876 г. - Telephone patented

Описание:

The telephone, a revolutionary invention that allowed the transmission of sound across long distances, was patented. Its inventor, Alexander Graham Bell, explained that the telephone "could make a current of electricity vary in intensity precisely as the air varies in density during the production of sound." He made the first successful telephone call on March 10, in which he told his assistant, "Mr. Watson, come here. I want you."