Website Name
Member States
Dates of Accession |
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| Austria | 1 June 1959 |
|
| Belgium | 1953 |
|
| Republic of Bulgaria | 11 March 1999 |
|
| Czech Republic | 1 July 1993 |
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| Denmark | 1953 |
|
| Finland | 1 January 1991 |
|
| France | 1953 |
|
| Germany | 1953 |
|
| Greece | 1953 |
|
| Hungary | 1 July 1992 |
|
| Italy | 1953 |
|
| Netherlands | 1953 |
|
| Norway | 1953 |
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| Republic Poland | 1 July 1991 |
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| Portugal | 1 January 1986 |
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| Slovak Republic | 1 July 1993 |
|
| Spain |
1 January 1961 to 31 December 1968 |
|
| Sweden | 1953 |
|
| Switzerland | 1953 |
|
| United-Kingdom | 1953 |
Candidate for Accession
| Romania | 2008 |
Associate Member State in the pre-stage to Membership
| Israel | 2011 |
| Republic of Serbia | 2012 |