On June 19, 1953, the execution of Julius and Ethel Rosenberg in the electric chair at Sing Sing ended one of the most sensational cases of the McCarthy era. It was the first execution of civilians for espionage in US history.

Learn more about the trial of the Rosenbergs.

On June 19, 1970, the Patent Cooperation Treaty, creating a system of international patent registration procedures between contracting states.

Learn more about the Patent Cooperation Treaty from the World Intellectual Property Organization.