| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 27/05/1952 | |
| CANADA | Signature | 27/05/1952 | |
| DENMARK | Signature | 27/05/1952 | |
| FRANCE | Signature | 27/05/1952 | |
| GREECE | Signature | 27/05/1952 | |
| GREECE | Acceptance | 18/09/1953 | |
| ICELAND | Signature | 27/05/1952 | |
| ITALY | Signature | 27/05/1952 | |
| LUXEMBOURG | Signature | 27/05/1952 | |
| NETHERLANDS THE | Signature | 27/05/1952 | |
| NETHERLANDS THE | Acceptance | 08/03/1954 | |
| NORWAY | Signature | 27/05/1952 | |
| PORTUGAL | Signature | 27/05/1952 | |
| TURKEY | Signature | 27/05/1952 | |
| UNITED KINGDOM | Signature | 27/05/1952 | |
| UNITED STATES OF AMERICA | Signature | 27/05/1952 | |
| UNITED STATES OF AMERICA | Acceptance | 02/08/1952 | |