| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 17/04/1950 | |
| BELGIUM | Ratification | 12/10/1950 | |
| FRANCE | Signature | 17/04/1950 | |
| FRANCE | Ratification | 17/12/1951 | |
| LUXEMBOURG | Signature | 17/04/1950 | |
| LUXEMBOURG | Ratification | 12/01/1952 | |
| NETHERLANDS THE | Signature | 17/04/1950 | |
| NETHERLANDS THE | Ratification | 10/08/1951 | |
| UNITED KINGDOM | Signature | 17/04/1950 | |
| UNITED KINGDOM | Ratification | 29/07/1950 |