How is the '@' symbol evolved?

@ Symbol to specify mail accounts. It has been in use since 1885. It was then used to refer to the rate of the term for the purpose of accounting. Later in 1971, the computer network address was used as a sample @ sample vector model. In 1885, the symbol was introduced as the "American Underwood" in Keyboard. . . Shortly after the disappearance of 1971, Raymond Tomlinson used the Natural Division in the mail message, each named @ in the name of the country.