| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 27/05/1952 | |
| FRANCE | Signature | 27/05/1952 | |
| GERMANY FEDERAL REPUBLIC | Signature | 27/05/1952 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 01/04/1954 | |
| ITALY | Signature | 27/05/1952 | |
| LUXEMBOURG | Signature | 27/05/1952 | |
| NETHERLANDS THE | Signature | 27/05/1952 | |
| NETHERLANDS THE | Ratification | 09/03/1954 | |
| UNITED KINGDOM | Signature | 27/05/1952 |