| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 12/12/1961 | |
| AUSTRIA | Ratification | 12/04/1962 | |
| BELGIUM | Signature | 12/12/1961 | |
| BELGIUM | Ratification | 12/05/1965 | |
| DENMARK | Signature | 12/12/1961 | |
| DENMARK | Ratification | 05/04/1962 | |
| FRANCE | Signature | 12/12/1961 | |
| GERMANY FEDERAL REPUBLIC | Signature | 12/12/1961 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 13/11/1962 | |
| GREECE | Signature | 12/12/1961 | |
| ICELAND | Signature | 12/12/1961 | |
| ICELAND | Ratification | 02/03/1962 | |
| IRELAND, REPUBLIC OF | Signature | 12/12/1961 | |
| ITALY | Signature | 12/12/1961 | |
| LUXEMBOURG | Signature | 12/12/1961 | |
| NETHERLANDS THE | Signature | 12/12/1961 | |
| NORWAY | Signature | 12/12/1961 | |
| NORWAY | Ratification | 10/05/1962 | |
| PORTUGAL | Signature | 12/12/1961 | |
| SPAIN | Signature | 12/12/1961 | |
| SPAIN | Ratification | 23/07/1962 | |
| SWEDEN | Signature | 12/12/1961 | |
| SWEDEN | Ratification | 06/08/1962 | |
| TURKEY | Signature | 12/12/1961 | |
| UNITED KINGDOM | Signature | 12/12/1961 | |
| UNITED KINGDOM | Ratification | 06/08/1962 | |