The Czech Republic joins
Statement of the government of the Czech Republic on questions of membership in International Governmental Organizations:
In connection with the dissolution of the Czech and Slovak Federal Republic on December 31, 1992, the Government of the Czech Republic declares the interest of the Czech Republic to be, after January 1, 1993, a fully-fledged member of the following international governmental organizations in the activities of which it has so far participated within the membership of the Czech and Slovak Federal Republic: [CERN is listed along with 51 other international organizations.]
The Czech Republic joined CERN as a member state on 1 July 1993.
The Slovak Republic joins
From CERN council minutes, 17 March 1993:
At its 297th meeting on 17 March 1993 Committee of Council discussed the accession of the Slovak Republic. Delegations indicated their unanimous support for the proposal of the accession.
The Slovak Republic joined CERN as a member state on 1 July 1993.