| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 12/05/1949 | |
| BELGIUM | Acceptance | 31/07/1951 | |
| CANADA | Signature | 12/05/1949 | |
| CANADA | Acceptance | 08/02/1950 | |
| DENMARK | Signature | 12/05/1949 | |
| DENMARK | Acceptance | 27/06/1951 | |
| FRANCE | Signature | 12/05/1949 | |
| ICELAND | Acceptance | 04/06/1952 | |
| IRELAND, REPUBLIC OF | Signature | 27/06/1949 | |
| IRELAND, REPUBLIC OF | Acceptance | 02/05/1950 | |
| NETHERLANDS THE | Signature | 12/05/1949 | |
| NETHERLANDS THE | Acceptance | 29/11/1951 | |
| NORWAY | Signature | 12/05/1949 | |
| NORWAY | Acceptance | 28/06/1950 | |
| PORTUGAL | Signature | 12/05/1949 | |
| PORTUGAL | Acceptance | 03/08/1950 | |
| SWEDEN | Signature | 12/05/1949 | |
| SWEDEN | Acceptance | 04/02/1952 | |
| UNITED KINGDOM | Signature | 12/05/1949 | |
| UNITED KINGDOM | Ratification | 13/01/1950 | |
| UNITED KINGDOM | Acceptance | 13/01/1950 | |
| UNITED STATES OF AMERICA | Signature | 12/05/1949 | |
| UNITED STATES OF AMERICA | Acceptance | 23/08/1949 | |