1978: The first international applications under the Patent Cooperation Treaty are filed.
On This Day • June 1
Ranked historical events for this date.
1979: The first black-led government of Rhodesia (now Zimbabwe) in 90 years takes power.
1988: The Intermediate-Range Nuclear Forces Treaty comes into effect.
1990: Cold War: George H. W. Bush and Mikhail Gorbachev sign a treaty to end chemical weapon production.
