| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 03/06/1955 | |
| BELGIUM | Ratification | 25/03/1958 | |
| BELGIUM | Withdrawal | 01/05/1968 | |
| DENMARK | Signature | 03/06/1955 | |
| DENMARK | Ratification | 20/06/1958 | |
| DENMARK | Withdrawal | 21/04/1967 | |
| FRANCE | Signature | 03/06/1955 | |
| FRANCE | Ratification | 25/03/1958 | |
| FRANCE | Withdrawal | 23/09/1967 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 21/04/1955 | |
| GERMANY FEDERAL REPUBLIC | Signature | 03/06/1955 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 06/09/1957 | |
| GERMANY FEDERAL REPUBLIC | Withdrawal | 23/08/1969 | |
| Land Berlin | Extension | 06/09/1957 | |
| NETHERLANDS THE | Signature | 03/06/1955 | |
| NETHERLANDS THE | Ratification | 01/10/1955 | |
| NETHERLANDS THE | Withdrawal | 11/05/1971 | 26/09/1976 |
| UNITED KINGDOM | Signature | 29/04/1955 | |
| UNITED KINGDOM | Signature | 03/06/1955 | |
| UNITED KINGDOM | Ratification | 13/01/1958 | |
| UNITED KINGDOM | Denunciation | 26/04/1963 | |