| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 17/10/1951 | |
| BELGIUM | Acceptance | 14/02/1952 | |
| CANADA | Signature | 17/10/1951 | |
| CANADA | Acceptance | 21/01/1952 | |
| DENMARK | Signature | 17/10/1951 | |
| DENMARK | Acceptance | 02/02/1952 | |
| FRANCE | Signature | 17/10/1951 | |
| FRANCE | Acceptance | 14/02/1952 | |
| ICELAND | Signature | 17/10/1951 | |
| ICELAND | Acceptance | 29/01/1952 | |
| ITALY | Signature | 17/10/1951 | |
| ITALY | Acceptance | 15/02/1952 | |
| LUXEMBOURG | Signature | 17/10/1951 | |
| LUXEMBOURG | Acceptance | 05/02/1952 | |
| NETHERLANDS THE | Signature | 17/10/1951 | |
| NETHERLANDS THE | Acceptance | 07/02/1952 | |
| NORWAY | Signature | 17/10/1951 | |
| NORWAY | Acceptance | 24/01/1952 | |
| PORTUGAL | Signature | 17/10/1951 | |
| PORTUGAL | Acceptance | 08/02/1952 | |
| UNITED KINGDOM | Signature | 17/10/1951 | |
| UNITED KINGDOM | Acceptance | 06/12/1951 | |
| UNITED STATES OF AMERICA | Signature | 17/10/1951 | |
| UNITED STATES OF AMERICA | Acceptance | 11/02/1952 | |