| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 12/05/1949 | |
| CANADA | Signature | 12/05/1949 | |
| DENMARK | Signature | 12/05/1949 | |
| FRANCE | Signature | 12/05/1949 | |
| MEXICO | Signature | 12/05/1949 | |
| NETHERLANDS THE | Signature | 12/05/1949 | |
| NORWAY | Signature | 12/05/1949 | |
| PORTUGAL | Signature | 12/05/1949 | |
| SWEDEN | Signature | 12/05/1949 | |
| UNITED KINGDOM | Signature | 12/05/1949 | |
| UNITED STATES OF AMERICA | Signature | 12/05/1949 |