The Czechoslovak Republic (, ) existed between 1948 and 1960. The Czechoslovak Socialist Republic (Czech and , ČSSR) was the name of Czechoslovakia from 1960 to 23 April 1990, when the country was under Communist rule. It was a satellite state of the Soviet Union. Following the coup d'état of February 1948, when the Communist Party of Czechoslovakia seized power with the support of the Soviet Union, the country was declared a socialist republic after the Ninth-of-May Constitution became effective. The traditional name ("Czechoslovak Republic") was changed on 11 July 1960 following the implementation of the 1960 Constitution of Czechoslovakia as a symbol of the "final victory of socialism" in the country, and remained so until the Velvet Revolution in November 1989. Several other state symbols were changed in 1960. Shortly after the Velvet Revolution, the Czechoslovak Socialist Republic was renamed to the Czech and Slovak Federative Republic.