The Patent Cooperation Treaty was signed on 19th June 1970. The PCT provides a single platform for protection of inventions that emerge from the signatory states.
However, the PCT came into effect only years later on 24th Jan 1978.
The @ sign on the 33 Teletype keyboard which Ray Tomlinson used to invent the email system was located on alphabet "P" key. One had to use shift to type it. [more...]