The first pay telephone was installed on the corner of Main Street Main Street and Central Row in downtown Hartford, Connecticut on 1st June 1889. It was invented by William Gray (patent US#454470) and developed by George A. Long.
The device was actually “postpay” which meant that the coins were to be deposited after the call was placed.
Ray Tomlinson, the inventor of email at ARPA, used the "@" sign to signify that the message was sent to a person and not a machine. [more...]